My plan would be
a) Sort out immediate family and kids so their futures are secure (but not so secure that they have no ambition) - max £10m
b) I live in area that has been forgotten by government for generations - I would create a foundation with at least £50m invested to generate an income every year that would be allocated to local good causes - schools, sports clubs, volunteer groups, kids play areas, sponsoring kids from deprived backgrounds into Further Education etc - in theory even at 2% return that would be £1m a year that could do a whole lot of good in our community. The initial capital amount should remain remain untouched, to continue to do good long after my death. Running the foundation would be my main interest as I would need to do something
c) Probably fritter away a bit
d) Look for good local business investments
e) Have a world class hair weave
f) There are 8000 homes in the town I live in - each would receive a £200 voucher that could be spent in small businesses in the town