diff --git a/mod/quiz/accessmanager_form.php b/mod/quiz/accessmanager_form.php
index e2e6fc5e241..df1c42fe9f1 100644
--- a/mod/quiz/accessmanager_form.php
+++ b/mod/quiz/accessmanager_form.php
@@ -15,58 +15,11 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
- * Defines the form that limits student's access to attempt a quiz.
+ * File only retained to prevent fatal errors in code that tries to require/include this.
  *
- * @package   mod_quiz
- * @copyright 2011 The Open University
- * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @todo MDL-76612 delete this file as part of Moodle 4.6 development.
+ * @deprecated This file is no longer required in Moodle 4.2+.
  */
-
-
 defined('MOODLE_INTERNAL') || die();
 
-require_once($CFG->libdir.'/formslib.php');
-
-
-/**
- * A form that limits student's access to attempt a quiz.
- *
- * @copyright  2011 The Open University
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
-class mod_quiz_preflight_check_form extends moodleform {
-
-    protected function definition() {
-        $mform = $this->_form;
-        $this->_form->updateAttributes(array('id' => 'mod_quiz_preflight_form'));
-
-        foreach ($this->_customdata['hidden'] as $name => $value) {
-            if ($name === 'sesskey') {
-                continue;
-            }
-            $mform->addElement('hidden', $name, $value);
-            $mform->setType($name, PARAM_INT);
-        }
-
-        foreach ($this->_customdata['rules'] as $rule) {
-            if ($rule->is_preflight_check_required($this->_customdata['attemptid'])) {
-                $rule->add_preflight_check_form_fields($this, $mform,
-                        $this->_customdata['attemptid']);
-            }
-        }
-
-        $this->add_action_buttons(true, get_string('startattempt', 'quiz'));
-        $this->set_display_vertical();
-        $mform->setDisableShortforms();
-    }
-
-    public function validation($data, $files) {
-        $errors = parent::validation($data, $files);
-
-        $timenow = time();
-        $accessmanager = $this->_customdata['quizobj']->get_access_manager($timenow);
-        $errors = array_merge($errors, $accessmanager->validate_preflight_check($data, $files, $this->_customdata['attemptid']));
-
-        return $errors;
-    }
-}
+debugging('This file is no longer required in Moodle 4.2+. Please do not include/require it.', DEBUG_DEVELOPER);
diff --git a/mod/quiz/accessrule/accessrulebase.php b/mod/quiz/accessrule/accessrulebase.php
index 3bccd0181f8..c433c9f8092 100644
--- a/mod/quiz/accessrule/accessrulebase.php
+++ b/mod/quiz/accessrule/accessrulebase.php
@@ -22,6 +22,7 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+use mod_quiz\form\preflight_check_form;
 
 defined('MOODLE_INTERNAL') || die();
 
@@ -108,12 +109,12 @@ abstract class quiz_access_rule_base {
      * Add any field you want to pre-flight check form. You should only do
      * something here if {@link is_preflight_check_required()} returned true.
      *
-     * @param mod_quiz_preflight_check_form $quizform the form being built.
+     * @param preflight_check_form $quizform the form being built.
      * @param MoodleQuickForm $mform The wrapped MoodleQuickForm.
      * @param int|null $attemptid the id of the current attempt, if there is one,
      *      otherwise null.
      */
-    public function add_preflight_check_form_fields(mod_quiz_preflight_check_form $quizform,
+    public function add_preflight_check_form_fields(preflight_check_form $quizform,
             MoodleQuickForm $mform, $attemptid) {
         // Do nothing by default.
     }
diff --git a/mod/quiz/accessrule/offlineattempts/rule.php b/mod/quiz/accessrule/offlineattempts/rule.php
index 511be30f145..f88f3832854 100644
--- a/mod/quiz/accessrule/offlineattempts/rule.php
+++ b/mod/quiz/accessrule/offlineattempts/rule.php
@@ -22,6 +22,7 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+use mod_quiz\form\preflight_check_form;
 
 defined('MOODLE_INTERNAL') || die();
 
@@ -63,7 +64,7 @@ class quizaccess_offlineattempts extends quiz_access_rule_base {
         }
     }
 
-    public function add_preflight_check_form_fields(mod_quiz_preflight_check_form $quizform,
+    public function add_preflight_check_form_fields(preflight_check_form $quizform,
             MoodleQuickForm $mform, $attemptid) {
         global $DB;
 
diff --git a/mod/quiz/accessrule/password/rule.php b/mod/quiz/accessrule/password/rule.php
index 778e3902891..6e48b904178 100644
--- a/mod/quiz/accessrule/password/rule.php
+++ b/mod/quiz/accessrule/password/rule.php
@@ -23,6 +23,7 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+use mod_quiz\form\preflight_check_form;
 
 defined('MOODLE_INTERNAL') || die();
 
@@ -54,7 +55,7 @@ class quizaccess_password extends quiz_access_rule_base {
         return empty($SESSION->passwordcheckedquizzes[$this->quiz->id]);
     }
 
-    public function add_preflight_check_form_fields(mod_quiz_preflight_check_form $quizform,
+    public function add_preflight_check_form_fields(preflight_check_form $quizform,
             MoodleQuickForm $mform, $attemptid) {
 
         $mform->addElement('header', 'passwordheader', get_string('password'));
diff --git a/mod/quiz/accessrule/timelimit/rule.php b/mod/quiz/accessrule/timelimit/rule.php
index ea061398801..08dd92d4a6b 100644
--- a/mod/quiz/accessrule/timelimit/rule.php
+++ b/mod/quiz/accessrule/timelimit/rule.php
@@ -23,6 +23,7 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+use mod_quiz\form\preflight_check_form;
 
 defined('MOODLE_INTERNAL') || die();
 
@@ -74,7 +75,7 @@ class quizaccess_timelimit extends quiz_access_rule_base {
         return $attemptid === null;
     }
 
-    public function add_preflight_check_form_fields(mod_quiz_preflight_check_form $quizform,
+    public function add_preflight_check_form_fields(preflight_check_form $quizform,
             MoodleQuickForm $mform, $attemptid) {
         $mform->addElement('header', 'honestycheckheader',
                 get_string('confirmstartheader', 'quizaccess_timelimit'));
diff --git a/mod/quiz/accessrule/upgrade.txt b/mod/quiz/accessrule/upgrade.txt
index f883b6e1143..41e505834bd 100644
--- a/mod/quiz/accessrule/upgrade.txt
+++ b/mod/quiz/accessrule/upgrade.txt
@@ -2,6 +2,12 @@ This files describes API changes for quiz access rule plugins.
 
 Overview of this plugin type at http://docs.moodle.org/dev/Quiz_access_rules
 
+=== 4.2 ===
+
+* Note that class mod_quiz_preflight_check_form has been renamed to
+  mod_quiz\form\preflight_check_form.
+
+
 === 2.8, 2.7.1, 2.6.4 and 2.5.7 ===
 
 * New static method delete_settings for access rules, which is called when a
diff --git a/mod/quiz/classes/access_manager.php b/mod/quiz/classes/access_manager.php
index 2f40e81ed70..ea1c6e7fadc 100644
--- a/mod/quiz/classes/access_manager.php
+++ b/mod/quiz/classes/access_manager.php
@@ -17,9 +17,9 @@
 namespace mod_quiz;
 
 use core_component;
+use mod_quiz\form\preflight_check_form;
 use mod_quiz\question\display_options;
 use mod_quiz_mod_form;
-use mod_quiz_preflight_check_form;
 use mod_quiz_renderer;
 use moodle_page;
 use moodle_url;
@@ -384,17 +384,17 @@ class access_manager {
      * @param moodle_url $url the form action URL.
      * @param int|null $attemptid the id of the current attempt, if there is one,
      *      otherwise null.
-     * @return mod_quiz_preflight_check_form the form.
+     * @return preflight_check_form the form.
      */
-    public function get_preflight_check_form(moodle_url $url, ?int $attemptid): mod_quiz_preflight_check_form {
+    public function get_preflight_check_form(moodle_url $url, ?int $attemptid): preflight_check_form {
         // This form normally wants POST submissions. However, it also needs to
         // accept GET submissions. Since formslib is strict, we have to detect
         // which case we are in, and set the form property appropriately.
         $method = 'post';
-        if (!empty($_GET['_qf__mod_quiz_preflight_check_form'])) {
+        if (!empty($_GET['_qf__preflight_check_form'])) {
             $method = 'get';
         }
-        return new mod_quiz_preflight_check_form($url->out_omit_querystring(),
+        return new preflight_check_form($url->out_omit_querystring(),
                 ['rules' => $this->rules, 'quizobj' => $this->quizobj,
                       'attemptid' => $attemptid, 'hidden' => $url->params()], $method);
     }
diff --git a/mod/quiz/classes/form/preflight_check_form.php b/mod/quiz/classes/form/preflight_check_form.php
new file mode 100644
index 00000000000..a734d137fec
--- /dev/null
+++ b/mod/quiz/classes/form/preflight_check_form.php
@@ -0,0 +1,64 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace mod_quiz\form;
+
+use moodleform;
+
+defined('MOODLE_INTERNAL') || die();
+
+require_once($CFG->libdir.'/formslib.php');
+
+/**
+ * A form that limits student's access to attempt a quiz.
+ *
+ * @package   mod_quiz
+ * @copyright  2011 The Open University
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class preflight_check_form extends moodleform {
+
+    protected function definition() {
+        $mform = $this->_form;
+        $this->_form->updateAttributes(array('id' => 'mod_quiz_preflight_form'));
+
+        foreach ($this->_customdata['hidden'] as $name => $value) {
+            if ($name === 'sesskey') {
+                continue;
+            }
+            $mform->addElement('hidden', $name, $value);
+            $mform->setType($name, PARAM_INT);
+        }
+
+        foreach ($this->_customdata['rules'] as $rule) {
+            if ($rule->is_preflight_check_required($this->_customdata['attemptid'])) {
+                $rule->add_preflight_check_form_fields($this, $mform,
+                        $this->_customdata['attemptid']);
+            }
+        }
+
+        $this->add_action_buttons(true, get_string('startattempt', 'quiz'));
+        $this->set_display_vertical();
+        $mform->setDisableShortforms();
+    }
+
+    public function validation($data, $files): array {
+        $errors = parent::validation($data, $files);
+        $accessmanager = $this->_customdata['quizobj']->get_access_manager(time());
+        return array_merge($errors, $accessmanager->validate_preflight_check(
+                $data, $files, $this->_customdata['attemptid']));
+    }
+}
diff --git a/mod/quiz/db/renamedclasses.php b/mod/quiz/db/renamedclasses.php
index 9d953c12f9b..7256a8b8890 100644
--- a/mod/quiz/db/renamedclasses.php
+++ b/mod/quiz/db/renamedclasses.php
@@ -52,4 +52,5 @@ $renamedclasses = [
     'mod_quiz_attempts_report_options' => 'mod_quiz\local\reports\attempts_report_options',
     'quiz_attempts_report_table' => 'mod_quiz\local\reports\attempts_report_table',
     'quiz_access_manager' => 'mod_quiz\access_manager',
+    'mod_quiz_preflight_check_form' => 'mod_quiz\form\preflight_check_form',
 ];
diff --git a/mod/quiz/locallib.php b/mod/quiz/locallib.php
index f7abd0a28e7..db534cc1a68 100644
--- a/mod/quiz/locallib.php
+++ b/mod/quiz/locallib.php
@@ -31,7 +31,6 @@
 defined('MOODLE_INTERNAL') || die();
 
 require_once($CFG->dirroot . '/mod/quiz/lib.php');
-require_once($CFG->dirroot . '/mod/quiz/accessmanager_form.php');
 require_once($CFG->dirroot . '/mod/quiz/renderer.php');
 require_once($CFG->dirroot . '/mod/quiz/attemptlib.php');
 require_once($CFG->libdir . '/completionlib.php');
diff --git a/mod/quiz/renderer.php b/mod/quiz/renderer.php
index 3c33af87a05..be7f147b816 100644
--- a/mod/quiz/renderer.php
+++ b/mod/quiz/renderer.php
@@ -26,6 +26,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 use mod_quiz\access_manager;
+use mod_quiz\form\preflight_check_form;
 use mod_quiz\question\display_options;
 
 
@@ -428,7 +429,17 @@ class mod_quiz_renderer extends plugin_renderer_base {
         return implode(', ', $attemptlinks);
     }
 
-    public function start_attempt_page(quiz $quizobj, mod_quiz_preflight_check_form $mform) {
+    /**
+     * Render the 'start attempt' page.
+     *
+     * The student gets here if their interaction with the preflight check
+     * from fails in some way (e.g. they typed the wrong password).
+     *
+     * @param quiz $quizobj
+     * @param preflight_check_form $mform
+     * @return string
+     */
+    public function start_attempt_page(quiz $quizobj, preflight_check_form $mform) {
         $output = '';
         $output .= $this->header();
         $output .= $this->during_attempt_tertiary_nav($quizobj->view_url());
@@ -900,22 +911,15 @@ class mod_quiz_renderer extends plugin_renderer_base {
      *
      * @param string $buttontext the label to display on the button.
      * @param moodle_url $url The URL to POST to in order to start the attempt.
-     * @param mod_quiz_preflight_check_form $preflightcheckform deprecated.
+     * @param preflight_check_form $preflightcheckform deprecated.
      * @param bool $popuprequired whether the attempt needs to be opened in a pop-up.
      * @param array $popupoptions the options to use if we are opening a popup.
      * @return string HTML fragment.
      */
     public function start_attempt_button($buttontext, moodle_url $url,
-            mod_quiz_preflight_check_form $preflightcheckform = null,
+            preflight_check_form $preflightcheckform = null,
             $popuprequired = false, $popupoptions = null) {
 
-        if (is_string($preflightcheckform)) {
-            // Calling code was not updated since the API change.
-            debugging('The third argument to start_attempt_button should now be the ' .
-                    'mod_quiz_preflight_check_form from ' .
-                    'access_manager::get_preflight_check_form, not a warning message string.');
-        }
-
         $button = new single_button($url, $buttontext, 'post', true);
         $button->class .= ' quizstartbuttondiv';
         if ($popuprequired) {
@@ -1474,7 +1478,7 @@ class mod_quiz_view_object {
     public $buttontext;
     /** @var moodle_url $startattempturl URL to start an attempt. */
     public $startattempturl;
-    /** @var mod_quiz_preflight_check_form|null $preflightcheckform confirmation form that must be
+    /** @var preflight_check_form|null $preflightcheckform confirmation form that must be
      *       submitted before an attempt is started, if required. */
     public $preflightcheckform;
     /** @var moodle_url $startattempturl URL for any Back to the course button. */
diff --git a/mod/quiz/upgrade.txt b/mod/quiz/upgrade.txt
index f9b020dabf0..2eaa0eebfc6 100644
--- a/mod/quiz/upgrade.txt
+++ b/mod/quiz/upgrade.txt
@@ -36,6 +36,7 @@ This files describes API changes in the quiz code.
   - mod_quiz_attempts_report_options => mod_quiz\local\reports\attempts_report_options
   - quiz_attempts_report_table => mod_quiz\local\reports\attempts_report_table
   - quiz_access_manager => mod_quiz\access_manager
+  - mod_quiz_preflight_check_form => mod_quiz\form\preflight_check_form
 
 * As part of the clean-up, the following files are no longer required, and if you try to
   include them, you will get a debugging notices telling you not to:
@@ -45,6 +46,7 @@ This files describes API changes in the quiz code.
   - mod/quiz/report/attemptsreport_table.php
   - mod/quiz/report/default.php
   - mod/quiz/accessmanager.php
+  - mod/quiz/accessmanager_form.php
 
 
 === 4.1 ===