An interesting thread however the law is clear in respect of not allowing landing on a runway if another aircraft is already on it except at an aerodrome with licensed ATC who may give a "land after" clearance.
At airshows and, on application, at handicap air race venues an exemption is granted by the CAA to permit landing after without ATC intervention and leaving it up to the pilots to ensure safety.
In the long past days of grass airfields without runways the procedure was to turn left after landing allowing the next aircraft to land to your right. It left it to the second pilot to ensure adequate separation was maintained from the first. It worked well and was largely carried out without radio. I wonder what the interpretation would be nowadays?
Cheers,
Trapper 69