Mrs. Keen (Celia Imrie) is the new Headmistress of St Bernadette's Primary in Coventry and is in a state of agitation due to an imminent inspection.
So, when Mr. Shepherd (Martin
Clunes) arrives at the school with his daughter Lauren (Lauren
Hobbs) she assumes him to be the new Super Teacher she
is expecting to help prepare for the inspection.
He first meets classroom assistant Desmond
Poppy (Marc
Wootton) who wants the school to enter a flash mob
competition.
When Mr Shepherd loses his memory after
being kicked in the head by Archie the Donkey, he forgets he is a teacher, a
father, and his impending wedding in New York to Sophie O'Donnell (Catherine
Tate).
So, Mr Poppy tells him that he is the
headmaster, and Mr Shepherd works for him and he and the class set out on a
madcap adventure to restore his memory with fantastic flash mobs a plenty.