Dodos, I would agree with the others, take a look at both sets. Before you buy, check sources other than aviation shops, I got mine through Smiths at a much reduced cost, order them on line and have them delivered to your local shop, saves delivery charges.
I am trying to compare both sets before buying one of them. By the way, as I said in my first post there is a good discount on one of the websites and I compared prices to other shops and the best price you can find is in the one with discount.
The premises at Manchester do have a shop as well as the warehouse I think, at least there was one last time I visited.
They may have the APM (Thom) range of books as well as AFE's (Pratt), but obviously they are going to favour their own series. I believe that they and Pooleys now cross sell each other's ranges. If you want to be sure email or phone them before you go.
Thanks a lot for information. I will email/phone them on Monday and see what they say.