It comes down to it now and is it did back then and has done since the end of the second world war: Money. Or Rather Britain's lack of it. Attempting to create further forces in the gap of 1989-1995 which the normal twilight timeline allows is to play with, is quite hard to do.
The suppression of eastern Europe uprising's and the Gulf war might get you a few battalions from a political stand point. But financial reasoning is harder to find. General Hackett in his
The Third world war justifies the creation of Britain's II corps by the government not supporting the creation of channel 4.
The Sino-Soviet war probably drums up quite a few sales in the arms and aerospace industries and perhaps some more from the middle east from the Israelis and friendly Arabs but would that be enough?
Going with the Canon take on things. A Second Corps for Europe (Thereby a creating an army group) A division for the Far East (Mostly infantry), A brigade for the middle east and then a smattering of a Battalion or lower garrisons in the few remain colonial outposts is about it
What was this Louie?