On the other hand, I believe a South african IC can work rather well:
Ger1: Invade french east africa with 4 inf (2 from transport), 1 tank. Assume no losses.
UK1: Transport over 2 inf into territory directly below frech east africa, fly fighter to south africa, build IC there.
Ger2: Attack Territory below fr. eas. afr, assume 1 inf. lose.
UK2:build 2 inf, or possibly 1 inf 1 fighter.
Germany will now face 3 infantry and 1 fighter( or, preferably, 2 infantry and 2 fighters) vs. likely 3 infantry and 1 tank. Barring lucky dice, germany will not be able to take it, and the UK can now pump 2 tanks a turn and retake africa.
The germans are now faced with two options:
Build transports, and pump more men into africa
or
Forget africa, concentrate on defending europe, crushing russia.
If they choose the first option, they’ll have to buy at least 1 or 2 transports, and it’ll be at least 4 turns before they can take S. Afr, and even when they do take it they will gain very little from it, as they will already have all of africa at that point.
If they choose the second option, UK gains the 11 prod. from africa, and then can push forces into asia in attempt to aid the likely beleagured russians.