Ronald Searle, who turns 90 on Wednesday ... I was given boxes of his unused invoice pads to use as sketch books with my indelible pencils – the ones that made purple ink when you licked ...

Nigel Molesworth, curse of St Custards, presents a guide to 'skool' life. Adapted by Patrick Barlow and George Poles from the books by Geoffrey Willans and Ronald Searle.