The carbon emissions mate. Flying is the most polluting form of transport.
Hmm. Not sure. Being the PM would mean that he'd have security detail (MI5?), Police, PAs, advisors, Entourage and the like coming down with him..
So you're probably talking 20 vehicles? Just completely guessing there.
So when you tot that lot up maybe less of a difference?
I certainly get having a go at Johnson, just think that a world leader in this instance isn't being outrageous flying there. If he'd flown to Brighton or something then yeah.