Ladybird's Royal Wedding
I blame flickr for having groups dedicated to this stuff.
Royal Wedding: A Ladybird souvenir by Audrey Daly (1986). ISBN 0-7214-0986-5
Originally 75p, I paid 10p from one of the Walworth Road charity shops.
The wedding was on 23rd July 1986, Ladybird got this dreadful children's book out on 28th July!