I got some advice from TPS
Unsolicited calls here begin either
"Hallo."
"Hallo, may I speak to Mrs Aitch?"
"Mrs Aitch, my mother, lives in Thistown. I'm Miss Aitch.
"Oh, sorry, Miss Aitch."
If I don't have business with their company, the conversation turns to my explaining I'm with the Telephone Preference Service.
Or
"Hallo."
"Hallo, may I speak to Mrs Arr?"
"Mrs Arr moved [number of] months ago."
I explain that I am with the Telephone Preference Service and ask for the name of the business and number they are calling from as I wish to stop receiving unsolicited sales and marketing calls. I usually find they hang up at this point.