There doesn't seem to be the same urgency to toilet train children now. When I left my daughter for a weekend ,aged 1, she came back from granny with a new outfit, hairdo and knickers!
One son trained by 2 other took longer 3 plus.
Daughter only began to think of training when son was nearly 3, still in night pants and brother 4 recently out of nappies but in pants at night too.No one is worried.
Being quizzed by chemist's assistant in Boots.
To think that London, or anywhere else for that matter, does not belong to any one demographic