The MInder car lot used to be in my road, so I did see Denis Waterman & George Cole around from time to time
But the only sitcom I remember seeing being filmed was an episode of Spaced when they used the office block where I worked
I popped out for a Ciggie and saw Simon Pegg lying on, a mattress, made awkward eye contact and then I moved round the corner
After seeing it later I think it was an episode where they were getting some artwork from some office in a Matrix style
The episode ends with their mate on a bike getting into the sound of the traffic signals like they are rave music
Oh and I remember my mate telling me he'd seen the Only Fools and Horses crew filming in Putney Cemetery, which turned out to be the Granddad funeral episode