Assuming I would win around £60M or so I'd buy my favourite car - Nissan GTR and buy my friends their favourite cars and go on a road trip around the world for a few months, staying in the best hotels and doing the best things in each country, it would be awesome!
Then I'd give about £5M to my mom & dad, £100k to each of my friends, family and people I know. Store the rest (£50M) in multiple high interest bank accounts which would work out to be roughly (at a 3.5% interest rate) £36k a week, £145k a month, or £1.75M a year.
With that free money coming into my bank account I'd rent a 8 bedroom house where me and my friends would live, kit the house out with everything we've ever wanted, huge cinema room, heated pool, garage for our cars and so on
But having so much money, more than I could ever need, would probably cause me to be bored with it, so I would most likely become a philanthropist, giving back to the community and donating to charities around the world, basically doing something productive and helpful

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To be honest, I've never been a materialistic person, so I wouldn't buy expensive useless things, like clothes worth thousands and art. I would buy the things I need and maybe treat myself to a few things but nothing over the top!
And yes I have thought about this quite a bit haha
