“After the curtain came down we sat in the dressing room, not knowing what to say. We were all so shocked.”

Sid died of a heart attack, aged 62, and was pronounced dead on arrival at the hospital.

According to Cliff Goodwin’s biography of Sid, the actor suffered a severe heart attack in 1967, which saw him stop smoking and try to live a healthier lifestyle.

This is also why in the Carry On film Carry On Doctor, Sid spent most of the film in bed, as he was suffering health issues at the time of filming.

According to Olga, his friends had warned him not to tour and to spend some time relaxing in the wake of his health difficulties.