If you have more than a single child of school age, £90k in London is not that much. Two kids at a private school in Northern England will run you £30k, I imagine in London it will be a tad more.
I explitliy mentioned: for one person. Of course, if you want to raise a family with private schols and a big house in the middle of London, that won't work. But let's not twist my words here.
Never mind private schools, housing costs go through the roof if you want them to have their own room or, god forbid, a garden. Not to mention nursery fees if you both need to work to cover the mortgage and bills.
