But I would suggest that planing on conquering Germany on the second turn is very ambitious of you.
Do you mean Russia? I admit it is pretty difficult to have German hoardes in Russia by the end of G2. It is however, a little more feasible to be in Russia by G3. (using the IC on Karelia as a place to quickly put down 3 tanks) The more time Germany gives Russia to live, the more time for the Allies to rush help to Russia. If Russia is still alive by G5, Germany should just paint a big red target on itself and wait to be ground into a fine, gray powder.
About UK’s help, all they can do is land planes in Russia, and the RAF was probably destroyed in Karelia (thus the entire debate) If they weren’t in Karelia, then the German invasion will be stronger when it makes the right hand turn into Moscow.