From: Keith A of Hertford
I watched "Darkest Hour" on Friday.
The choice was to give up a little sovereignty or face the loss off billions in money and hundreds of thousands of lives instead.

They chose to preserve their full sovereignty and take the hit.

It might be a 'slight' loss of sovereignty for the UK, but it would also mean the acceptance that Germany could keep controls of all the land they had already conquered, or were in the process of conquering, or had invaded, and planned to conquer.

Under those circumstances it was not just a matter of what was best for Britain.

And as Germany had ignored the settlements following WW I there could be no certainty that they would keep any new agreement.

And that is called paying the Dane-geld;
But we've proved it again and again,
That if once you have paid him the Dane-geld
You never get rid of the Dane.
(Kipling)