John Challis, who played Boycie in Only Fools And Horses, acted alongside Fortune.
Paying tribute to his friend, he tweeted:
So sad to hear that John Fortune has died.I played henchman to his chief villain in Cat's Eyes and we laughed a lot.Another goodun gone.
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Thousands of demonstrators have marched through Boston in opposition to a right-wing rally in the city which was eventually cut short.