The sad fact is that the Forces have been hollowed out so much in recent years that we'd be stuffed on Tornado and Typhoon too without BAES. Likewise the contractors on MFTS etc.
Finding true specialists within the trades, with years of experience on type, in 2nd line bays, frontline and training Sqns etc is becoming increasingly rare. In fact it is these ex-CPOs, CTs etc that now work for the contractor.
I can't see LM and F-35 being all that different to be honest.