The fun of driven shooting isn't just big bags and grand estates. Those have a mystique of their own and I wouldn't give up doing them occasionally. But, I've had as much or more fun on a single gun day where you ate quick shop sandwiches in a converted trailer and got a comprehensive tasting of everyone's home-made sloe gin as a double gun day with a four course lunch and damned good wine in a ducal lodge. In fact, the birds were just as good and that's what it comes down to, after all. You can pay 120GBP a brace for awful grouse or get great birds for friendship.
In this connection, remember the wife's comment on her unfaithful spouse, "While he was out shooting, I had a five-hundred bird day at Harrods." Figure 45GBP/bird and do the math
