I would still go for the United Kingdom we have some of the best infantry such as SAS and Fusiliers and the green jackets and we have good support armour as well as a number of good heavy tanks, all useful for supporting the infantry to have to finish the job and takes the vital points.
Unfortunately, despite its good infantry, UK has some historical weakness that a cunning strategist will use against them:http://www.tumblr.com/tagged/britons?before=1321406905
By the way, that was an exact plan of a Soviet offensive in 1980th in Europe.http://www.exile.ru/articles/detail.php ... LOCK_ID=35
Burlakov is not too respectful, to put it mildly, about the West German military: "We had a sea of tanks on the [Soviet] Western Group. Three tank armies! And what did the [West] Germans have? The [German] workweek ends Friday and then you wouldn't find anyone, not a minister or a soldier. Just guards. By the time they realized what was happening, we would have burned up their tanks and looted their armories."