Yes, you'd hear "our Sharon", "our Kylie", all over the North. I assume it is thrown in as a counterbalance to our Hyacinth's perfect speech patterns - Patricia Routledge* is a great actress and "does" Hyacinth "Bouquet" to perfection. my father-in-law uses Hyacinth as a pet(?!) name for my mother-in-law. No comment!

* In particular for Mrs. Malaprop (on stage) and for Alan Bennett's "Talking Heads" (BBC).