Not trying to be intrusive. DH and I are doing some life planning and part of that is budgeting whether we can afford to move and renovate. I've lost the plot of what is 'normal' in terms of monthly repayments, possible because we've been lucky to be on a low rate for so long. We are paying £1500 a month for a 3 bed victorian cottage in zone 3/4. Its getting a bit small but to renovate and move, in a few years that monthly amount will be more like £3,500.
I'd be curious to know what your repayments are (or at least, a percentage of your income) and how many kids you have.
Asking with Londoners in mind rather than anyone as obviously this city warps things!