you get all sorts of sour sweeties in Woolworths - tho not really sour. My fella loves all things sour - particualrly sour Skittles, Sour Chewits (which you don't see much just now) and Sour Suckers...available at Woolies in a tube.
i DARE you to try toxicwaste -seem to be available in yorkshire but not midlands
www.toxicwaste( com or co.uk)
truly foul and bitter,cost �1 made in pakistan(!) imported to preston
you have been warned
I agree with tali and gilli, toxic waste are the sweets to try! The first time I had one I had to spit it out, but I'm a pro now, can eat one completely! You make them a million times more sour if you crunch them...try it! You might have to scout around a bit to find a shop which sells them though but you should be able to find one locally.