Here are two answers to questions from Defra in response to questions from Kerry McCarthy MP:
On subsidies for grouse shooting: http://www.parliament.uk/business/publications/written-questions-answers-statements/written-question/Commons/2016-10-20/49693/
On the financial contribution of driven grouse shooting: http://www.parliament.uk/business/publications/written-questions-answers-statements/written-question/Commons/2016-10-20/49691/
Defra doesn’t know how much of your money it pays to grouse moors.
Defra hasn’t a clue whether driven grouse shooting contributes anything to the UK economy (although it has some mates who say it does).
Much is made by grouse shooters of their economic contribution but government, now, is starting to back away from backing them up.