Bradford is a little out of the way for me, no luck with the Corydoras, but Bardills could still have some...If not the guy I went to today said he could order some for me.
Anyway, I went to East Midlands Aquatics and for saying it's all done in a garage and it looks pretty basic, the stock is impressive, there is an extensive variety, he even had rays! I came back with 8 Ember Tetra's, 6 Cherry Shrimp and a Bristlenose Pleco all for £20, so not too bad!