Hi Georgi,
Thanks for the info on the fifth torpedo tube, I didn't know that.
I'm afraid there are no published (or leaked) photos of a pumpjet on any of the Churchills, apparently these were highly classified at the time and never released since then. I guess it will take many years before these will appear but one never knows.
I just checked Google Earth on the status of the dockyard in Devonport. I don't share your analysis: there are clearly three hulls of the Valiant/Churchill class present. See the yellow arrows. The other eight are indeed Swiftsure/Trafalgar types.
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A few years ago this basin looked like this: the boat laying by itself is Courageous.
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The fourth Churchill is at the Rosyth dockyard:
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The the right (smaller) one is Dreadnought. So there is one missing of the five: probably that's Courageous, being moored at a different location as an exhibit in the Devonport Heritage Museum. I couldn't find her in Google earth though, maybe she's undergoing maintenance or modifications at various locations (not spotted by spying satellites...)
I hope you see the differences with the Swiftsures? The tails of the boats are more slender, and when you look closely you can see the attachment of the forward dive planes on the foredeck, which is not there on the Swiftsure/Trafalgars.