I would spend a small proportion (maybe 2 or 3 mil) of the initial lump sum just to sort out family and friends in the short term.

I would invest the bulk and use the interest/profit to set up a long-term sustainable source of income so my family were always wealthy and good courses would continue to benefit over the long term.

It should be possible to see £10 million per year in interest from that sort of capital, you could live like a king, do loads for charity, ensure your great (great, great, great) grandkids were looked after and spend hardly a penny of the initial winnings.