Turns out the P1 laps were on shagged tyres with a passenger. From comments:
Giving our good friend Stef who is a great writer for Blackflag Jalopnik a few hot laps in the P1. The tires were pretty shagged by this point in the day, but still some great fun was left in them. I am always thankful for the wonderful people this great sport brings into my life and the fantastic driving experiences I am allowed to have. Thanks all, J