Thank you, thank you, thank you
I ordered some books from musicroom.com , the service was excellent, and the products are great. Just what I was looking for.
DS2 has just worked through Theory made easy for little children bks 1 & 2 I cannot recommend these books highly enough. They are Malaysian, where there is a tradition of children doing music early, and the books are really aimed at tiny little ones: aged 4 and 5. A lot of the questions are answered using stickers, so there is not so much pencil work required. Ds2 has adored doing these books. And at £2.50 a go, with no P&P charge, they are a bargain as well!
I'm off to buy some more books now.