Who became the first rider in Speedway Grand Prix history to win a GP whilst being entered as a wild card?

Player #96919, in my day I used to go to Wimbledon. The days of Ivan Mauger. Happy days.

King Kenny Carter was the one I used to go and watch when he rode for Halifax Dukes at the Shay Stadium. what a sad and tragic end to both him and his wife's lives in 1986. It needn't have ended that way.