MSOCS, the F35B will be a UK asset, whether it should be is beyond the scope of this reply.
The fact that it is means that we, ie the UK, will have to make the best of it period.
The only chance of that is if the services jointly push for the very best outcome from their purchase.
This is further compounded by the seeming impossibility of any national "improvement" programmes.
making a purse out of a sow's ear...?
Good luck with that.