Also, as mentioned but not responded to on the last trans thread, several of us have 'unisex' names, and are 'misgendered' on a regular basis, without getting upset about it.
Whilst I understand that there is a difference between someone secure in their gender and someone who identifies out of their sex, and also that it is different when a mistake is made on email as opposed to in a face to face situation, I still feel that it is a huge assumption to say that others will be 'unhappy' when they are misgendered.
To back up Rosie, and to make this point yet again, many of us on these threads have made it clear that we do use people's preferred pronouns when we know them. Why wouldn't we? As we keep saying, we are not transphobic.
The point is not whether we want to use particular pronouns, but that it is very rarely necessary to use a pronoun other than 'you' when addressing someone, so this is, as far as I can see, an empty gesture that seems to be an attempt to position M&S as having a 'finger on the pulse'. I think, however, to mix my metaphors, that it will backfire, as the tide is turning.