In the last episode of Series Three, 'What a Tangled Web', Sid the caretaker laments at length that 28 years ago he was married, despite having a whole previous episode ('How's Your Father' from Series Two) about Mr. Brown offering to pay for him to wed his partner after hearing Sid never married her.
In the first episodes, the classroom number is visibly 5; later on, the number 7 appears on the door. (It is of course possible that the school changed the numbering of its classrooms.)
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