Formal letters using my first name

I dont mind it at all.
Part of my mind still thinks of Mrs......... as my long-gone MIL!

I dislike it because it assumes a familiarity which does not exist.

I welcome less formal ways better than some uptight expectations historically. I’m a Ms, not Mrs or Miss. I was never Mrs (husbands initial) husbands last name. I was Ms iam from my twenties and I’m still her in my late seventies

Most formal letters address me as Mrs A but I don't think I would mind my first name being used.

You wouldn’t last long in Australia. They very rarely use surnames anywhere. I think it is nice and friendly, personally.

Nope. In business matters I prefer to keep it formal. My family and friends use my first name. I dont feel the need to be friends with my energy provider or my financial adviser.

I prefer formality, especially when receiving a circular letter from a bank informing me of some further inconvenience in their service.

Many years ago I addressed a letter of complaint addressing the Chairman of British Gas by his Christian name, asking him how he liked it, and pointing out that they were not my "energy adviser", as their last letter had claimed, but one of my energy suppliers.

But I was amused to receive a series of letters from a bank with which I had no connection, addressed to Mr. Gone Away. My reply, adopting the name they had given me and seeking details of my sort code and account number, did not receive a reply.