I succeeded a Sea-Lion on G3, I caught my opponent by surprise and it required a Carrier, 1 DD and 1 TP built in Med sea to provide cover for Battleship and a Gibraltar invasion on G2 while attacking Egypt with 1 Italian Infantry and 1 Tank crossed Med Sea in Lybia G1 with 1 Fg landed in Lybia (returned on Carrier G2 NCM).
On G1, I used 1 Fg (land on Carrier) and 1 StB to sink the UK Destroyer near Egypt.
Three of my Fgs were placed in Western Europe in G2 NCM, ready to fly through Manche and make an assault on London.
You may built a Carrier in Baltic with more TP to invade UK G2 but, usually the UK player see you coming.
My strategy was a bit covert because I didn’t buy anything in Baltic and appeared to be a massive Naval investment to hold on to Africa and Med against USA (invading Morocco USA1).
I accepted to loose a lot of planes since 2 TPs means only 3 fodders and 1 Tank to take hold of UK.