Apologies for the thread creep, WEBF!
BHR: I trust you saw the excellent "Real Dad's Army" series on Channel 4 last month? Was a decent investigation into the real state of readiness of the UK to deal with an invasion (an awful lot of forgotten history in there, preparations were advanced and sizable). It concluded such an invasion would almost certainly have failed not far from the beachheads, before reaching the "Winston Line", with the havoc caused by the RN in the channel one of the main factors behind the impossibility of maintaining supply lines.
It included some very interesting footage of wargames played by senior UK staff and surviving representatives of German forces at the time (Galland, etc.) several years later (nineteen fifties?), from which some of the conclusions were drawn.
Also, SS GB by Deighton provides an interesting "what if" vaguely along the lines you're suggesting, if you've not already read it.
Last edited by Polikarpov; 10th April 2006 at 10:05.