Why does Halifax discriminate when I use my maiden name?

After getting married I use my maiden name for work – but I can’t cash chequesFollowing your item in August 2017, I have experienced the same discrimination from Halifax over the use of my maiden and married surnames. I use my maiden name as my professional name and my passport also carries it. It is therefore still very much my identity. I also have a stocks and shares holding (not with Halifax) in my maiden name. When I wish to withdraw funds they send me a cheque in my maiden name