I do not think is much used by Londoners themselves. I agree, but remember that Khris Kristofferson is not a Londoner. He may have lived in England a long time but I would have thought his first word for a train that runs underground would be subway and he wrote the song after all. I think a better indication of it being Anglocised (Is there such a word?) is him going to the Golden Lion for a pint of Bitter. While such things do happen Stateside they are not as common as over here and, as Emmylou's version shows, not everyone in the US knows what a pint of Bitter is!

Mind you, our very own Marie Little had someone drinking a bottle of Wild Turtle instead of Wild Turkey! I suppose it is not so much knowing your language as knowing your booze:-)

Cheers

DtG