The other has got to be a German, a Frenchman, or a Dane.
Huh? How many Germans have won the FA cup?
Those three I am sure on. London I don't think has done very well in the Champions Cup. I think there has to be a scottish one in there and the easy answer says:
The question was not limited to Champions Cup, all European Cups are valid. And as Arsenal won the Cup Winner's cup in the early to mid nineties (don't remember better) and Chelsea in 1998 (plus their current semi-final participation) London is definitely one of the five.
I'll be more enthusiastic about encouraging thinking outside the box when there's evidence of any thinking going on inside it.
(Terry Pratchett)