I think I would bid at least 12 (2 inf Lib, 6 IPC to spend).
I’ve been challanged to similar games (only ADS) and would win the bid with 8,9, and 10. I lost those games.
It depends on how comfortable you are with the Allies.
The extra cash isn’t much of a factor, but I think you still need the 2 inf to Lib to make sure you take with sufficient for to rule out a counter on UK 1.
If you are Germany, try to kill Egy in 1 rd of battle. I’d probably go: 4 inf, 2 arm, 1 ftr,1 bom - that was with 2 bid to Lib.
Anything less and I think UK can counter fairly easily.
In LL, assuming the game goes longer than 4-5 rds, you are going to need the Afr income and try to reach IPC parity (or close to it).
So, 12 would probably be my starting point now a days.