There will be update today, sorry guys I got some stuff to do.
However in answer to the burning tech question where am I?
In land forces I would say I was historically ahead of where the Germans where at the end of '43.
In airforces I am bit behind. I have the second generation of bombers but not fighters. I would say that Jet's are at-least a year away though.
In the Navy I slightly behind in surface ships and miles behind in submarines. (at started throwing some money into surface ship technology)
On the Rocket front I am not far away from some very nice things.
On the Nuclear front I would guess at least 2-3 years away from the bomb (probably more).
I hope this helps.
To invade the UK I feel I would need several things. Air superiority (I don't want my transports bombed and really want to give the defenders a damn good bombing just before my men come ashore) However that would stick me a BoB scenario where the advantage lies with the defender. I large investment in Naval transport capacity (to make the first wave powerful enough to get a shore and then ferry in enough reinforcements and supplies to push inland), and also a surface fleet to screen the transports. I could not rely solely on Naval Aviation to defend the invasion force. It would be too god dam risky.
An easier option is to drive though Persia to India and ease the pressure on the Japanese, and still hurt the UK.