Lone Wolf, you are bang on with regard to bespoke fitting a P8.
As we all know the Donks are a huge % of the cost, putting Rolls Royce on a P8 vice CFM56 puts a major chunk of the expenditure back in to the UK purse.
Now add an ATOS mission system. kerching again.
The money starts to trickle back.
An additional advantage would be no ITAR restrictions!