But is it wise to buy F35s when the US refuses to allow access to the source code on the software? Plus a fair number of the integrated circuits come from Taiwan, so if the PRC got cobby with Taiwan, spares could suddenly be a problem unless the tapes for the layouts and test programmes were available. Plus there are very few semiconductor plants outside Taiwan and the PRC with capability of handling 12 inch wafers and sub 0.18 micron technology - and none in the UK, although the US still has a few.