The Lancaster contribution to the BBMF is in recognition of all the thousands of Bomber Command personnel who lost their lives. Personally, I'm slightly less comfortable with the sight of a strategic bomber being a symbol of memorial than a point defence fighter, but there you go.
The Vulcan represents a bygone age – skint post war Britain managed to design and operate not one but three hugely expensive strategic bombers, the Victor and Valiant aircraft are oft overlooked. Imagine Britain finding the cash for three wholly individual designs for nuclear attack submarines today and you have some idea of the cost involved.
I stood right behind a Vulcan being given the full moo at an airshow as a child, the bloody thing nearly knocked me off my feet. Given that the number of people who lost their lives to a Vulcan's bombs doesn't outnumber the amount of Vulcan crews lost during training, I have far less issue with them being kept flying today.