Epsom Down bugs

[squiperly]

I was on Epsom Down for the racing last year and walking back up to the car through the long grass we suddenly found ourselves in the middle of a swarm of flying bugs. They seemed to come up from the grass and were quite large green insects, about the size of bumble bees. Neither I nor my partner had seen anything like them before, and I thought they were quite cute once we realised they didn't sting or bite. Does anyone know what they are? They seem to come out in May and June especially.

[gen2]

Could be a type of cockchafer often called a May Bug or a June Bug. Try google images and see if they match.