The airfield was NOTAMMED closed to all aircraft due to a drag race meeting on the main runway.
STILL a clown in a Seneca landed even though the runway was clearly obstructed with a start line gantry, the pits, and dragsters travelling at up to 200mph. He'd called on the radio, got no reply so assumed Reg was at lunch and landed anyway, but the crux is he hadn't attempted to make contact for PPR.
I would argue that this is not a case for PPR, but a case for people to read the NOTAMs (and properly punishing those who don't). I know UK/Europe has a love affair with making the rules cater for the lowest common denominator of idiot, though...