Would Germany have won the war if they invaded Britain, given Br pre organised guerrilla resistance

I was quite interested to see other allied nations view on the outcome of the war if Germany had managed to invade Britain. My inspiration is the book 'Fatherland' which sees Germany's occupation of Britain much like France's. Also forcing the USA to abandon the support of 'free' Europe and concentrate on the rising Japanese threat. If we are talking about the successful destruction of the RAF, there is no doubt the Germans would be able to launch an invasion party. However, they would hav...