1. I think it is accurate to say that I have never in real life seen anyone in a top hat.
2. That's London, where if you have a normal conversation with colleagues on a tube you can see everyone else looking at each other in amusement at simple country folk not knowing the etiquette of determined silence.
3. Contactless has been widespread for about three years, the limit is £30 but I was told the other day by a shop assistant that the limit had been removed - unsure of the accuracy of this
4. Power switches - the main benefit is being able to leave devices that draw a small current even when off plugged in but not drawing current, when I was a kid we were always warned that TVs had been known to start fires when switched off but plugged in.