saracenman, virtually all of that letter is utter nonsense. Sorry, but that's the brutal truth.
However, no-one can deny your enthusiasm. Had the rear-engined BAC-311 ever been built, it would probably have made as good a tanker as the A310MRTT.
Now - what's this really barking mad idea a little bird whispered in my ear recently about attempting to remove 2 Mk17 HDUs from utterly shagged-out K4s and install them in 2 modified VC10C1Ks....?? Someone please tell me that's a wind-up......it is, isn't it?