I disagree in general. I mean some are, but when I travel and am coming back via Heathrow, I quite often sit myself near a group of first-time visitors on the T

I disagree in general. I mean some are, but when I travel and am coming back via Heathrow, I quite often sit myself near a group of first-time visitors on the Tube, just because its interesting to evesdrop on their impressions. Typical American family looking through the window at the surburban streets: "Look at those houses, they are so small". Seeing through other people's eyes can be fascinating.