I think I agree with you, loved living and working in London and loved Sydney too but I was much younger then.
Now I live in a town where more than two cars at a traffic light is a traffic jam and on the rare occasion I drive in Sydney it is my idea of hell.
It’s what you are used to.
London can be very expensive. My sister and husband lived there for some years. I lived on the outskirts until I lived there then I and I moved with my new wife until I retired. Then we moved up to Yorkshire which was much cheaper and a larger house.
Various parts in the new place:
I lived in Finsbury Park and then Brixton Hill in flats coincidentally at the same number address, they weren’t particularity expensive in those days but this was the late 60s, early 70s
Finsbury Park reminds me of my childhood days, when my dad used to take me to the park, to play on the swings during my school summer holidays. 
