Seeing the Brits consistently polling in the 15% range is amusing. I wonder if the French being the subject of the poll has anything to do with that.
Brits and their Empire were the only ones fighting for the entire duration of the war. They didn't have the capability to liberate mainland Europe alone, but they sure did make everything difficult for the Axis. I've always felt that a peace between the Commonwealth and Axis, as Hitler envisioned, was the most interesting counterfactual to consider. No need for an Altantic Wall, no bombing campaign, no base to invade France from, no African campaign, no naval interference for their shipping or need for a big U-boat fleet, etc. Also dramatically changes the calculus for the Japanese Empire in the Pacific. If the Brits aren't tied up in Europe, then an invasion towards the Indies becomes much less tempting, potentially leading to no Pearl Harbor and the USSR and China standing alone and being pressed from all sides.