Observations on London
1. Several times, younger passengers on the Tube (subway) offered me their seats. I have grey hair but do not appear (and am not) particularly feeble. I would be mildly surprised to have the same thing happen in the U.S.
2. Most hotels I have stayed in recently, in the U.S. and abroad, have a safe in the room with a combination that the guest sets. The hotel I stayed at in the U.K. didn't. That might mean that U.K. guests are less worried about pilfering by hotel employees than hotel guests elsewhere. Of course, my sample size is very small.
3. Walking through Notting Hill (no Napoleons visible) I observed the scene shown below, jam offered for sale with a request to put the payment through the house's mail slot. I cannot remember having ever seen a similar scene here, although I don't suppose it's impossible.