I appreciate you feel strongly about this policy issue and perhaps you will be proven right in your concerns but you asserted with ref to BASC that "matters like this should go to folks that actually know what they are talking about" and I explained that two BASC advisory committees were involved - Scotland committee, deer management committee. Its perhaps one thing to disagree with a BASC policy, but another to assert that those involved don't know what they are talking about just because one is in disagreement with the policy, if that makes sense.
As for greylags, it was Natural England that proposed adding them to a general licence, not BASC, and in the end Natural England did not add them to that general licence. I am not aware of any wildfowling clubs leaving BASC as a result of BASC's 2014 consultation response. Indeed BASC wrote to all wildfowling clubs about the consultation, clarifying that NE proposals were to allow control of breeding greylags such as the destruction of nests and eggs to prevent serious agricultural damage or disease. It was also pointed out that concerns were raised when Canada goose was added to several general licence many years previously in England and Wales, that those concerns did not materialise with populations continuing to grow and bag returns increasing on the foreshore. Hope that helps clarify the greylags policy of 2014.