Interesting reddit post. IIRC there was a UK program on lottery winners a while back and a lot of them were not happy at all.
Yeah I remember that one.
It is a very interesting post, and some very good advice.
Although Lotto does have a lot of advisers setup for this kind of thing as well, and they don't have a professional interest in what you do with your money.
I think the points about changing your numbers etc. is a very good one.
Also I (personally) wouldn't go public with my win, My parents have had a lot of good advice on setting up trusts etc. and as such I would probably do the same.
Spend some time with accountants calculating incomes from various fixed term, fixed return investments. Such as G7 treasury investments.
Lets assume you win the £40,000,000:
Provide 15% for your family in trusts etc. which leaves you with £34,000,000
Then take probably £25 million of this and invest in fixed return investments of around 3-5% (3% returns £750,000 p/a) and leaves you £9 million cash to "play" with.
Which would allow me to buy a new house, car etc. and I'd have a safety net of £750,000pa (less 20% tax which is standard on investments).
Which leaves you with around £50,000 / month pay.