A few things.
Normally the London transport system doesn't work like this. And we don't speak to tourists on the tube.
Normally there are fewer police around; and they're not always as friendly.
Oxford Street on a quiet day might feel quite relaxed, but normally, it's an unpleasant, slow-moving river of consumer insanity.
We're getting better at food in London; please don't judge us by the Olympic venues.
We have beer as well as bottled lager, and some of it's quite good.
Outside the Olympics, people wearing pink tee-shirts are not obliged to give you assistance.
So, with those caveats, please hurry back.