I think you'll find I said 'chances are' and 'can't know 100%' See I don't know him personally, but certainly chances are, and seems i was right!
But don't let the truth get in your way. As a child growing up in a working class area of Northern Ireland, everyone I knew either supported them or us, usually with an English team as well. I'd say Man U have a bigger following than Liverpool due to George Best. You were kinda born either celtic or Rangers dependant where you were born and your parents, you had more of a choice in your English team, most had one of them as well. You're a tad naïve about it all.
McEwans has it spot on.
But again, like London what do I know compared to you, I was only born and raised there, or live in London for years and years.
Enlightened you enough for tonight, though you have made me chuckle as well.