Co-stars Elaine Stritch and Donald Sinden died within two months of each other, in 2014. They were 89 and 90 respectively.
Dorothy McNab lives at (the fictitious) 41 Closewell Square in Chelsea. However, earlier episodes showed the number 33 on her front door.
The producer tried to get Terry-Thomas to play a recurring character part in this series, but the latter's suffering from Parkinson's disease made it impossible for him to sign the contract.