I didnt have that great experience at 'Bride to be' to be honest. I popped in to make an appointment and the lady said I could try on some dresses as they were free and despite me not wanting a huge dress she insisted on me trying on a big poofy thing and telling me 'it was the one' and therefore I wasnt allowed to try on any others. All a bit random.
Perfection bridal has some nice dresses, reasonably priced but a saturday appointment is a bit like a cattle market. You only get an hour and you have to put coloured tag on dresses you like then you are put in them one by one with the girl asking if you like this more or less than the previous one.
I had to buy my dress in Bucks as I fell in love with one online and they were the nearest stockists but my alterations were done locally by the lady that does them for Berkshire Brides. Some of the dresses I saw at her house were stunning. I do wish I had gone there as well.