I'm none of the above btw...
I realise that sounds flippant and I genuinely don't mean it to be. Can someone please explain in simple terms (I'm still very much learning about the whole gender issue so realise I should probably know this) why I can't claim to be any of the other protected characteristics (and rightly so - because I'm not) but somehow we've got to a stage where I can call myself Mr Dave and everyone is expected to go along with it? Are we likely to see more cases of people challenging the other protected characteristics as time goes on?