If you could go back to 1973....

[cherrybomb]

and know what you know now?

I would find out from newspapers as much as I could about a Mr. Bill Gates and what he was up to.

[Johnmof]

The key thing would be that you would know that Red Rum won the National and Tom Wesikopf won the British Open. Put all your worldly possessions on the double and wait till July to retire.

[elgroucho]

A few quid on Sunderland beating Leeds in the FA cup final would probably be a good idea too.

[Coobeastie]

Would have to be Microsoft for me and later on Google.