If you don’t mind, I’d like to toss in a few ideas for the UK - feel free to use/lose any of them:
Total Mobilization:
Citizens of the UK mobilized totally for war: victory gardens, scrap drives and extreme rationing provided the UK with extra material required to sustain them. Each turn, the UK collects an additional 2 IPC’s during the collect income phase.
Flak Battleships:
Capital ships of the Royal Navy underwent aggressive refit to equip them with strong anti-air defense. Prior to combat involving UK battleships and enemy air units, each battleship may roll one die against each enemy fighter. Like a land-based AA gun, each roll of a 1 is a hit.
Naval Tradition:
Crews of the Royal Navy displayed countless feats of bravery and sacrifice in the face of disaster; trading their own lives for effective fire control and counter flooding. When any surface ship (BB, CV, DD, TRN) is hit in combat, roll 1 die. On a roll of a 6, the ship “survives” the hit and remains in combat.