Overstretch
Funny old thing - the TTSC bid for FSTA utilises second-hand 767s from BA! Beags knows his stuff on this and is generally close to the mark.
The present PPP sounds like the Emperors Clothes to me. The top solution would be a mixed fleet of Strat and Tac capability AAR(much like now) although with multi-point dispensing on both fleets. How about 6 A330s(Air Tanker Bid) and 15 A310s(Luftwaffe MRTT). However, the military should own them.
It has been interesting to read comment on my initial AD Q about London although on a different thread! Wide divergence of opinions. Apologies if Sangiovese is offended by any of this.