Most London houses are not however over £10m, that is very rare and those would tend to be international business people etc although a writer married to the late Margaret Forster I think bought a big house in Hampstead in the 1950s and it was worth £6m. I think he may still live in it so there will be some like that. Now cross with myself that I remember her name and not his.... ah looked her up - Hunter Davies - www.theguardian.com/books/2014/nov/09/my-life-in-houses-margaret-forster-review-memoir-homes
"Soon, though, she is married and she and her new husband, the journalist Hunter Davies, move to London. For a while, they rent in Hampstead, and Forster is content. When they buy a big old house in Dartmouth Park, however, the mithering starts up again. The house is in a terrible state. Even worse, it has a sitting tenant, Mrs Hall, on the top floor. It comes as rather a shock to realise that it is now the swinging 60s and that among the visitors to the house are the Beatles (Davies is their biographer) and various film directors (Forster’s novel Georgy Girl is to become a movie).
Forster is mostly preoccupied with the abominable Mrs Hall, a problem eventually solved with the purchase of a flat elsewhere that she then lets to the sitting tenant. Forster scoffs at Mrs Hall’s tears when she departs, which seems a bit unfair given that she allowed herself a good bawl on leaving her precious Hampstead.
During a period as tax exiles (Mr Wilson wants to steal their cash), Forster, Davies and their children go to the Algarve, having hotfooted it there from (horrible) Gozo and – how amazing – they adore it, staff and all. After this period as lotus-eating expats, moreover, Forster is finally reconciled to her London house (she still lives there, 50 years on). After all, with Mrs Hall gone, they can finally “knock through” downstairs. A cottage in Northamptonshire doesn’t work out – “weekending is not for us” – but two houses in the Lake District, the first in Caldbeck, the second in Loweswate, definitely do. She and Davies spend the whole of the summer in the north, which means they’re able to settle."