Your having a larf egph
Ok, soi went with the Edinburgh option only to find that during the morning peak Edinburgh em security is still a complete shambles. It even makes T5 security arrangements look simple. However, I think the joke is on them 'cos I've yet to see anyone shopping in World of pain and anguish (duty free). I think they re afraid to step of the shiny black marble road. I think I can now see why Edinburgh has more delays than any other airport. Pax are lost in the system.
Since first posting my query I have been through EGPH 4 times, and used the train twice to get to London. Surprisingly, from centre to centre the train is almost as quick but more expensive!