Second report on Brit ver. 1.5, from (i believe) turns 36 thru 65.
The defensive strategy I outlined earlier (bomb roads in my own territory, set up fortresses in swamps and mountains that can not be attacked by armor, and build like hell) has worked very well.
I focused production on the Matilda II to create a defensive line, then built Spitfires until I could achieve air superiority, and then built Skua bombers (which seem to be very nasty). Land near cities was fully developed (except for railroads) and production was dwarfing the axis. Canada alone produced 2-3 aircraft per turn, which could fly to europe in 1-2 turns. (a Skua can deploy from newfoundland to Rhur in one jump.) India (second palace was in mandalay), South Africa, Ethiopia also became big producers. Brits have about 120 tanks, 40 spitfires, 30 skua, plus many militia, etc. Building at least 4 matilda's per turn world-wide, sometimes 6 or 7.
I decided to limit my aggression to just the axis. Once the line stabilized in burma (it was never really threatened), i landed tanks in france and built a fortress the next turn. repeated the process until i had a force to help shield the french. My strategy was to fight, or be attacked, only where i could win. gradually build up more units than them. French rebuilt, and actually took Paris (one turn) and Milan (held it).
Got into Paris. brought in more air. discovered that you can blow away axis air by bombing an area with many spitfires. the defense comes up until it is completely eliminated. spitfires win 3 out of 4 this way, and are back at full strength after 2 turns. takes axis longer to rebuild from scratch. once the air was eliminated, i could bomb a city and then attack with 2-3 dozen tanks. eventually the defenders are eliminated. was able to take paris, brussels, rurh and berlin within a span of 12 turns this way. The SAM battery is god-like, so i switched bombing to units outside of cities and improvements, within a few turns was able to destroy every improvement in northern germany. they were unable to move and produce - counter-attacks stopped. I stopped at this point - the writing was on the wall.
Conclusion: brits can definitely survive, and may be too powerful. i can see all three axis capital taken by around turn 100 (taking all cities would be longer, but forgone conclusion). problem before was that axis could get into india / africa too easily, and italian marines from ethiopia became troublesome very early. hate to say it but pendulum may have swung too far. milita was a good idea. they need it early on. matilda too - it provided a unit that could win on defense. but frankly, once developed. i had so many cities that i may have equaled all axis production. probably need to take some of those new cities back.
have you considered a version which starts in summer 1941 and has the russians locked in with the allies? brits could be given historical possessions.
i took a ton of notes. ask if you have questions.