Ah, but London is the capital. And the capital has Heathrow. And why would you go through Glasgow or Edinburgh? I'll bet that Urby lives in the southern section of England (just a guess, I think that's where the majority of UKers live), so why get a taxi/drive all the way from there? You limey fruitcake about 150% my age!
Out of curiosity, what country do you live in?