- it looks like the only rule is to tell the tower. Seems reasonable enough....
That's about it, but look out for additional rules that many airports have for purposes od extorting money from you. Also, you'll find differences in interpretation of what 'notice of the landing or departure' means.
Haven't you heard of the Air Navigation Order.
FWIW, I don't think you'll find anything about booking out in the ANO. And CAP 520 addresses a completely different topic.