Awful public transport?!
Where in the UK has better public transport than London? Pretty sure your seaside town does not.
There are also far more vibrant independent restaurants, pubs, pop up retail etc in London that most provincial towns because the number of residents and visitors supports that.
Compare that to decaying retail in many small towns - a few chains hang on but outside a few tourist hotspots, retail is in far worse state outside the big cities than in them.
Londoners also on average walk or use active transport like cycling more than any other part of the UK so it's certainly not true that the lifestyle is universally unhealthy.
Except the air pollution. That is definitely a problem.
It's not a utopia but it also isn't the hell hole so many people seem to want it to be.
It's fine that you decided you want a small, sleepy town. London is not a small sleepy town and cannot pretend to be.
This weekend, I was on a busy bus. A man with two children was on board with a buggy. He was wearing a Jewish skull cap.
A Somali woman in a hijab boarded with another buggy. Regular bus users will know two buggies can fit but it's a bit of jenga to get them in.
The man and woman smiles at each other, worked together to fit them in and then compared notes about how both kids in buggies had Bluey toys on them.
A young man then got up and offered the woman and her older child his seat while another woman was busy waving and smiling at the baby.
And then to wrap up this story, everyone talked about the weather and when spring would arrive, fulfilling every cliche about being British.
Given the grim news about German elections that I was reading at the time and everything that is happening in the US, I actually felt slightly proud of living here (and usually I think being proud of where you live or born is stupid because it is largely a matter of chance)