Many thanks, too everyone who replied,
Off course how silly for me to forget Britians Extensive Rail Network, I suppose once HS2 is complete, a connection by air between London and Liverpool will be Zilch I guess.
sadly I don't drive and I don't particularly like coaches/buses. So as British Rail put it "let the train take the strain" for the time.
I've done LHR/LGW - MAN with the 50-60 min train journey from Manchester Airport to Liverpool Lime St, this is not much quicker than the train direct from London Euston, even with BA/BD offering 30/35 min check-in.
I also didn't consider other factors such as APD, but it has been an interesting discussion.
Malaysian28