Deliberately wrecking the project as we don't like the consequences of our decision to leave, what could possibly go wrong ?
Apart from contracts leaving the UK of course, shortly followed by engineers who'd rather be employed in the EU than unemployed in the UK. Which is of course now starting to happen.
And design our own system, just as good, but cheaper? Why didn't they just add "with blackjack and hookers" after it, be just as realistic. It can be done of course, just not at a cost anyone will be happy with. Still, I'm sure the usual suspects will be happy to take a few hundred million off your hands to produce a study stating the bleeding obvious. Or we can pay the US a few billion to stick a teeny tiny Union Flag somewhere on the GPS system.
And finally if we keep wrecking ESA projects we're not going to last long before we get thrown out. This is nonsense on stilts.