Reporting back. Success! Didn’t follow instructions precisely. My airfryer tends to be quick so I started out at 100 rather than 105 and ended up cooking for 2 hours. Probably about 10 mins or so too long in the end. Did the crackling on 190 for 15 mins. Perfect! Earlier in the day I’d eaten Fage 5%, raspberries, double cream and almond butter in various quantities.