Sywell Airport in Northamptonshire has a shooting ground pretty much on its Northern edge. Not heard any reports of people picking up stray shot. The range is oriented such that the majority of shooting is towards the airfield (although there are high earth banks all round). Nothing larger than no 6 shot is permitted on the range and few people shoot anything larger than 7 or 7.5 anyway. All disciplines are available including ABT/DTL and sporting layouts (including a high tower). I'm sure if it were considered a risk then there would be an avoid on the site but no such advice exists to my knowledge.
I believe in UK law, any cartridge containing fewer than 3 or 4 projectiles counts as a Firearm (Class 1) rather than a Shotgun (Class 2) round and as such, the class 1 licence would be required