Re: Ah the good old days
Had a friend who won a weekly instant competition hosted on Prestel. He noted the page number that he'd been congratulated on, went back to that same page every week and voila - another win! Went on 'winning' for weeks until presumably someone noticed as it stopped working.
The only one of his prizes I remember was the 12" of Cameo's "Word Up", which gives you some idea of the quality of his winnings in general.