For the middle classes, the cost of living in London — the cost of getting by — long ago went past insane (£17,040: the cost per year of educating a four year-old child at Thomas's school in Fulham, not including uniform). It's the incredible price of property, of course, that's been the engine driving this madness, ratcheting the pressure ever higher on Londoners who don't own a home while making very wealthy, on paper at least, those who do.

For the last two decades and more, the capital's property market to all intents and purposes has behaved like a giant Ponzi scheme played on a global scale. Money from all over the world has poured into London bricks, inflating values unrealistically in relation to wages, while the lavish bonuses paid to European bankers working in the City have also stoked momentum responsible for pushing up, for example, the average price of a London semi-detached house by 553 per cent between January 1995 and November 2017, from £133,820 to £873,603.

Over the same period, the average cost of a detached house in the capital went from £257,748 to £1,453,271.