I would buy £20M of $AMD and ride it all the way until they issue dividends. At this point I would either take said dividends or sell the stock depending on how long it took to get there (roughly $300, currently $97, so a while). It's a company I believe in, unlike $NVDA and $INTL they do both cpu's and graphics cards, and where it counts; servers, they far outperform Intel currently.

£20M into index funds / dividend paying funds.

£20M into crypto.

£10M into a specific apartment in London, which rents for £6K a week currently. That sold for £8M I reckon I could buy it for a bit more.

£10M = 40 7/8 bedroom houses in a L/MCOL City in the South West that I know very well; student letting. At £60 a week board that's £499k in yearly rent before taxes / maintenance / letting agency, call it £300k to be way safe. remortgage all of them on a fixed based rate to buy 40 more, use the cashflow to pay the interest, rinse and repeat. Though in covid climate maybe not a good idea...

Give £10M to parents, but in a way that I don't essentially throw away 40% of that in inheritance tax in the future.

£10M left. Not sure what I would do with that. There's a house in the NW I like, semi, ideally needs reconverting into detached, call it £4M to buy the other half and do that. I wouldn't bother with cars etc because why flaunt it? Stealth Wealth please.