When I first moved to London maybe 15 years ago, Central was mega expensive compared to Zone 2-3. I remember looking at flats in Bloomsbury for £1,600 a month and thinking yikes. I lived in Balham and paid £925 a month for a flat of the same size.
I was looking for my niece who is moving to London soon. Flats in Central seem a lot cheaper than they were compared to the rest of London. Flats near where I was in Balham are now £2,000 a month but similar ones in Bloomsbury are £2,300.
It makes you wonder:
a) how anyone can 'save money by moving further out'
b) why anyone bothers commuting on the stinky tube