As Arti says, London is different in lots of ways.
I am in East Mids an area where deprivation and luxury are cheek by jowl , like London in that respect, I guess.
I was looking forward to visiting my neighbouring very posh village’s vicarage, as there were amazing gates at the end of the drive. In I went, only for the vicarage sign to point to a small drive off to the side to a very ordinary 70’s house.
Badly insulated, I hear.
They do seem to have reasonably good gardens though. Not necessarily massive, but not tiny either.
One vicar in my area made a point of planting a couple of fruit trees every garden he had, knowing he wouldn’t see the benefit. Several friends have fruit trees due to his foresight.
Somewhere dense like London, it’s probably harder to build a sensible modest vicarage in a suitable place, so they are stuck with what they have.
Poor show though.