Re: Hmm. Signalling?
Negotiation 101: If you do not like the deal and have at least one good card card, walk out.
Negotiation 102: If you have all the good cards, stand firm, let the other side walk out, and wait for the return.
Where is the UK's good card ? This sounds like Airbus 2.0, when Thatcher dumped Airbus for a US deal of hot air, losing 100 000 jobs and a UK-based production line.