Most of Britain isn't that cold, certainly not more so than Juneau or Seattle or Portland. In winter, most of Britain is far milder than Boston, Chicago, Detroit, Cleveland, Buffalo, or the interior Northeast.
I know, but I don't like those places either. lol
Ages ago, ( Back in the Stone Age) I vistited England for two weeks in December.
The weateher was MUCH nicer and warmer than what I had in my native Michigan.
And I was as far north as Scotland.....
The locals wee amazed that I wandered around in my light jacket....to ME it was balmy... ( Heck: the last rose wasn't dead in the park! And it was December! )