No need for a city pad (who actually wants to live in London?).
Got a country house (that's where I live).
Got the world's best girlfriend.
Currently in good health (the most important thing actually).
I suppose about £2M would make an adequate "DIY pension" pot, if one loses all income at 50 and wants to keep flying 150hrs/year in a SEP.
But one would give up work only if one does not enjoy one's work. No intelligent person wants to just suddenly retire and take up gardening.
Cars mean nothing; you can buy a used 250HP tyre burner with aircon for £2k (I drive a 1995 Toyota).
If you want to buy and fly a TBM850 then you need about £10M