I was, for a couple of years in the mid 1970s, half of the air staff general purposes cell in HQSTC called "Ops Nav & Wpns". We were lightly involved in low flying complaints, although the real paperwork was done in London.
Fox3WMB (#11) is no doubt right about sheep while Flying Lawyer (#6) touches on the subject of farmers a long way from London.
In my day perhaps 75% of the claims were for dead sheep in South Wales, I seem to remember mostly littering the Brecon Beacons. Virtually none now.