The 84-year-old actor, who made his name in Open All Hours with Ronnie Barker, said the script for the seventh and final spin-off series was ready to go.
The sixth season, with Sir David as Granville, was shown in 2019.
Asked if the show would finally be finished, Sir David said: "That would be wonderful, but you'd have to get in touch with Mr BBC about that.
Married
"The script is written by Roy Clarke. It's there and all it needs is the BBC to commission it.
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