Its not that hard.
Just ignore the CV and 2 AP build and let Germany attack London with 4 fighters, 3 tactical, 1 bomber, SB BB, SB CA, 3 tanks, and 3 Infantry vs. 10 Infantry and 2 planes
Remember tactical bombers are at 4, so you got 3/3/3/3/4/4/4/4/4/3/3/3/3/1/1/1/ vs 4/4/2/2/2/2/2/2/2/2/2/2/, which is 47 points vs. 28 ( depending on 2 fighters, or tactical bomber and fighter)
Of course AA will take a plane, but either way you LOSE and thanks to IL he saved you 10 minutes of looking at the odds.
Then when UK falls and UK won that battle against some Italian battleships, you will sleep well knowing the British people will be eating German food and giving her income to Adolf.
This is why Italy needs to be neutral till their own turn, because the game makes it a no trainer for Germany do do this build and play this move. It this rule existed, UK would not be required to bring the fleet to SZ 110 on UK1 to block, and also to build “infantry” when it really needs to build other things.
Germany would not need to build the “Fake-shemp Sealion fleet” if Italy was protected because she would rather have an air-force to use against Russia latter.