For me it has to be M-346 built and assembled at Yeovil by Leonardo. Allow them to build their 4,000ft runway to get it in and out. Then you have some resilience for UK-based aerospace manufacture. Warton has GCAP, Typhoon and the 15% share of all F35 to keep it afloat. But if New Medium Helo (NMH) doesn’t happen then Yeovil will fall for sure. Other than that it is Hawarden and its plant/runway now that Filton has gone.
M-346 can provide another NFTE base too with Deci and now Greece operating the type, then there will be resilience built in the NATO fast jet aircrew training system too.
I can’t think of any other way to keep the UK aerospace industry ticking over, without putting all the eggs in the Warton basket.