What would you do?

[poliss]

I would spend it on re-opening the Aln Valley Branch Line, which ran from Alnmouth to Alnwick. For those who have no idea where Alnwick is it's in the North East of England. Still no idea? Hogwarts school in the Harry Potter movies is actually Alnwick Castle. Although there is a society that hopes to re-open the line they don't have the money to build a bridge over the main North-South highway which means the line won't reach the original station.
If there was any money left over I'd spend it on designing and manufacturing a DCC control panel that had lots of slider controls for running several locos at once.