Even more detailed:
http://www.healthopedia.com/drugs/brandnames-0 -9.html
BTW: If you're looking for a UK pharmacy which will sell you cheap generic 'over the counter' medicines (rather than prescribed drugs), try the Co-op. I've found them great for things like hay fever tablets (30 Loratadine tablets for �1.99 rather than paying more than twice that amount for a handful of 'Claritin' branded tablets, which are exactly the same). Other pharmacies seem to be solely interested in maximising their profits).
Chris