This actually happened to me back in 1977...
When I was an apprentice machine tool fitter, I used to give one of the other lads a lift into work. One morning we stopped at a llittle newsagent in Langley for cigarettes and a newspaper, when who should we find in the shop but Ken Williams and a fim crew! Of course when he saw us, Mr. W went into full 'Ere, stop messin about!' mode, and tried to usher us both out of the shop until they had finished filming their little skit. Unfortunately, my companion was a terrible homophobe, and lost it big time with the camp Carry On star. In fact, he was so angry that he tried to assault the poor guy, and I eventually had to pull him off (oo-er missus!).