None!
Mickj3 asked about problems with the F-35. If MOD/RAF are having such problems with crossover of US to UK acceptance/standards/airworthiness/documentation etc with Rivet joint that has been flying all these years what will be the situation with the F35
Won't be any as it is a new aircraft and RAF are participating from the start. If the MAA has problems with those circumstances then the RAF had better decide never to buy any new aircraft.