wouldn't the operator be looking at a radar (perhaps a mobile one) and be ready to stop doing whatever they are doing if they see somebody infringing
Don't know about the UK, but that's not the case of any of our ranges. (except the naval ones, the ships have radar)
The range I quoted earlier is a army and airforce range, and we have no way of stopping the action should we see a infringement. (There are more then 20 ranges in it, and not all have comms.)
You can fly through the range during 155mm artillery fire, and come out the other end, it's just not smart. (Ask the US Army Blackhawk pilot that strayed over a M109 battery as it fired all 6 tubes. He is reported to have !!!! himself.... )