The (Government) Ministerial Department for Work & Pensions policies that individuals are to be referred to by their preferred name, gender pronoun and title, so they kinda are.
A doctor actually lost his job as his religious beliefs dictated that ‘So God created man in His own image; in the image of God He created him; male and female He created them’.”. Bit of a weird argument seeing as Eve was formed from the side of Adam (or his rib, depending on which translation you use) therefore it's completely biologically inaccurate argument for a Doctor to fall back on.
To be fair that is just a nice thing to do, call somebody by what they want to be called. It is no skin off anybody's nose to do that. I would expect the scenario ,with the extreme majority of the people who work for the DWP, would be to say Mrs directly to the person and when they say "no it is actually Mr" they would apologise and then try to say Mr.
The people who I have been in direct communication with were always of the mindset that if people try then that is good enough for them. They are understanding that we all have an indoctrination of saying certain things, especially those of a more older age. I do struggle at times, my wife is queer and doesn't like female pronouns, etc. The amount of times I say 'she/her' is something that I am trying to work on.
In a blasé example, it is the same as if somebody who is recently divorced doesn't want to be called Mrs. I very much doubt that if somebody said this that anybody would have any problems reverting to Ms/Miss, so why is it a problem from she to he/them or he to she/them?