Hi Sarah,
www.yoursite.com is just a way of demonstrating an address.
So https://www.yousite.com/course/index.php would be my way of telling you to go to
Englishlgcse.moodle.school/course/index.php as a way of bypassing the dashboard (and learning plan block).
This would have allowed you access to the admin menus to fix (turn off) the leaning plan block and recover the dashboard.
It was helpful to know about the learning plan block issue.
Thanks for posting.
Regards,
Vernon