Lepus Rex, I never won at Jet Set Willy but one of my brothers did using a cheat to give infinate number of lives. I was too clumsy to win even with this cheat as there were a couple of points where if you made a mistake, you just ended up in a loop of getting killed and getting a new life!

Full details on Jet Set Willy including the cheats and lots of other Spectrum stuff can be found at World Of Spectrum.

Jon