The UK latitude mostly doesn't overlap with the USA, with only Scotland just about lining up with the southern tip of Alaska and everything else only overlapping with Canada.

The UK climate is more like Seattle.

Is this map right? If so, that would be a zone 4? https://www.ecohome.net/guides/3521/climate-zones-map-usa-ca...

I have no idea if that makes any difference to your core point.