Over the years and at all levels I have found it is seen as incredibly naff, laughable and a little odd.
Are you sure you're mixing with the right crowd there?
Clockwork Mouse,
Oh, I agree 100%. My Mum in her later years had a few unplanned visits to various hospitals where they all just assumed they could call he Phyllis, which made her visibly wince. I recommended that it might be polite to call her Mrs Courtnage. All I got was blank looks so I pointed out that it might be less formal for them that calling her Alderman or Your Worship. They went with Mrs Courtnage.