Best endeavour is absolute nonsense, when you negotitate and sign knowing absolutely and totally full well that you have no intention of adhering to the contract. This is not a minor issue that has suddenly popped up out of the blue. The Deal was negotiated and signed with fingers crossed behind the back, with no intention whatsoever of respecting it.
Of course the UK can walk away now if they wish. And then what?
Can you imagine the consequences of fall-out- and the massive restrictions and tarifs put on goods and services both ways. With businesses leaving in droves as the UK can no longer access parts, and export freely. And perhaps even more importanty, the damage to our reputation, to our honour? The EU, and the world in general is watching this mess and most of them would not trust Johnson and team in a month fo blue moon Sundays.
Do you still believe 'we hold all the card' and that we just have to 'believe and be positive'.
If you do, that is truly staggering.