Hi spider as a bookshop manager (although we don't have a big childrens section and it's not my strong subject!) I've not come across anything like the ladybird series. I remember them really vividly too. I was in a secondhand bookshop the other day and they had loads, maybe you could start with charity shops or Oxfam bookshops where you live if you want the ladybird ones? I bought a couple for my nephew for 50p each and he loves them.
This is a brilliant site...linkwhich lists lots of the old Ladybird titles. I saw on your other post that you weren't too keen on the idea of second-hand books from Ebay - you can actually get some great bargains, and the books are often in very good condition. The Well-Loved Tales series are probably some of the most sought after (Cinderella goes for silly prices!) and expensive, but there are many others which are reasonably priced. I have built up a good collection from charity shops, car boot sales, and Ebay, and DD loves them.