ABIW & Tandemrotor,
As you are well aware ASI's stated that Aircrew are to have breakfast before flying. The Co-Pilot and the ALM's had breakfast in their respective Messes. It may be that the Captain had something to eat in the crewroom; but the BOI were unable to establish whether he had or not. What is certain is that the Captain attended the Met Office by himself. Why did the Captain @ Co-Pilot not breakfast together and attend Met together?
VecVec
I take your point re QFF but RAF norm would be Regional QNH for low flying and their route did take them towards cloud covered high ground. The salient point is that there was a major difference between the 2 Pilots altimeter settings. The BOI postulated that the Captains altimeter was set to Aldergrove QFE.