I asked AOPA in Oct 2003 to investigate why Harwell's P106 still exists.
I wonder why a nearby "disused airfield marked for navigation purposes only" isn't.
Mr Fraser was one very shocked balloon pilot who was practicing hedge-hopping & low approaches and crossed an innocent looking fence at the top of a hill expecting to see this navigation landmark. It was day 2 of the Gulf War
A phone call later that evening that began "Good evening sir... were you the pilot of G-B***" thankfully resulted in no further action.
Back to the topic... or at least where it's going... is it acceptable to break into a transmission if there is doubt over traffic that may cause a conflict ? The visibility at the weekend was particularly bad and I had trouble spotting traffic joining base when I was on downwind. Had the RT been busy, I would have been tempted to talk over the other pilot and make my apologies on the ground. What is the done thing ?