
Not actually sure wot AMP stands for , something Meat Products i assume.....its found all over the UK, if you email them, from teh website linked in teh other reply, they will tell you the nearest stockist to where u will be....i found them very helpful.
Pets at Home stores are usually found on retail parks on the outskirts of towns, having not been to sheffield or cornwall for about ten years, i cant help you there, sorry.....
Prices, about 50p for a block of frozen mince, (varieties are lamb, rabbit, beef, beef n kidney, tripe, etc) i think the bags of chunks are about £3.99 might be less though, its months since i bought any........a block of frozen mince should last a large dog one meal, or a smaller dog two meals, depending on if you mix it with veg n stuff..the bags of frozen chunks, like tripe, tend to last my three ickle dogs a couple of weeks, but they only have it once or twice a week.
HTH,
Em