Surely, the Germans wouldn't just permanently bar the British (and Franco-Russians, for that matter) from owning WMDs (superbombs included) in the peace treaty that ends the SGW, no? Amongst other military restrictions. I think the Germans would do whatever it takes to cripple the British, and prevent another one of her cities from being nuked.
I'm not 100% sure of your meaning here as I think there might be a typo? In any case, I don't think the Germans could actually ban the British from owning WMDs - that horse has bolted. As I've previously argued, even if the UK did officially relinquish its nuclear programme in the peace agreement, there is nothing to stop them from renewing it when the moment is ripe. They have the research, the expertise and the facilities. Germany can only 'cripple' the British by occupying the country outright, and Berlin has much more important things to worry about in France, Russia and other parts of continental Europe.
An anti-german UK is not going to survive. It is unconditional surrender or the bombing continues. The UK has no friends left. This means even something as drastic as the morgentau plan could happen here.
I respectfully disagree, for several reasons. Firstly, Germany would not be able to impose an unconditional surrender on the British. Yes, they could keep dropping atomic bombs on British cities - at least, until they run out of bombs (they're not exactly a quick build). There's also the fact that, although the British programme was a little behind Germany's, the UK was still capable of manufacturing and using atomic bombs, so Germany would face further atomic destruction if the two decided to enter into a protracted nuclear war - is that a price Germany would be willing to pay?
I agree that at the end of the Second Great War Britain's allies were largely defeated, but I do not believe that this would facilitate a German invasion and occupation of the island of Great Britain (which is presumably what you envision, if you believe something like the Morgenthau Plan could be implemented). The Royal Navy was down but it not out, whereas the German fleet had been defeated in 1943. It's very unlikely that the Germans would have been able to construct a new fleet within two years capable of decisively defeating the Royal Navy in its home waters, whilst simultaneously fighting a bitter land war on several fronts. It would be much wiser for the Germans to focus their attentions on pushing Russian influence eastwards and crippling France - especially as it is those land powers that pose the greater threat to German hegemony.