IF G1 builds are a CV and 2 TR and with good outcomes in the g1 naval attacks
then
UK must build 9 inf
They will have at min. 11 inf (one french) 3 fig, maybe 1 tact in the UK
(If the G1 sz 106 attack fails, then 1 arm, 1inf extra)
vs
Likely G2 Sea Lion attempt of 3 inf, 3 Arm, 2 fig, 2 tact, 1 bomber. (BB and CA fire support could be blocked by UK DD)
Germany would have to lose zero aircraft on G1 to give G2 Sea Lion a above avg.chance of more then a flip of the coin
If I am wrong, I would just add one more UK inf in the UK at the start ……Before making major changes to the game