How would one go about Grouse shooting in the UK without paying a fortune for a driven shoot?

Hi, I am very interested to go Grouse shooting in August but i'm not quite sure how to go about it. Are there any farmers anyone knows that let people do a bit of shooting or is there a club? or is there a reserve or do you know someone who owns a bit of the countryside? any help would be much appreciated and i would be able to spend a couple of pounds :)