Its also done wonders for the helping pull the Isles' economy out of the muck the Royal regieme put them in when they evacuated their island and threw the citizenry into a panic as well as the lose of the traditional trade with the Continent: your average East Anglian actually has a HIGHER income than your average Canadian at this point.
Britain can end the leases during any of the 10-year renegotating periods, provided she's willing to re-locate the Royal Navy across the ocean and accept she'll no longer be receiving the generous payments and will have to start paying for their petrol and other strategically sensative imports at the actual value of the Pound Sterling on the international market, rather than retaining their "strategic partner" exemption that aligns its value to the U.S dollar.
Yeah sure, but 40++ years of "Royal Abandonment" and de facto American administration has done wonders to "loyalty" of Old Britain".
In Ireland, Scotland, and Wales the previously small and insignificant independence movement grew stronger, and even some proper Englishmen started to thinking about treasons by advocating Republicanism instead of maintaining loyalty to the Monarchy. And let's say the other 'not-so-insignificant' movements who aim to integrate Old British Isles for admission into United States, citing shared language and the fact that the military administration is already american.
If things going as the current prediction goes, those who left from once mighty British Empire would be just Kingdom of Canada, Kingdom of Australia, and Kingdom of New Zealand. With Ireland, Scotland, Wales, South England, and North England joining United States instead.
In a world with Allied victory, or US outright fight against Nazi Germany from early on, British Isles would stay firmly as the heart of the British Empire, but if the US-backed independence movements still goes, ironically it could be the only thing left due to Canada, Australia, and New Zealand going independent instead of having Carolingian-style splitting.
And maybe Reichskommissariat Francia would be still a great power known as France, instead of being Western marches of GrossDeutschland Reich.