rebecca Cole

Hi, i'm really struggling to find the answer online so i hope someone can help. My mum is in a nursing home and we need to get a Unique Tax Reference for her as she is unable to. I have previously been able to access her HMRC information (with her permission) as the access code gets sent to her phone however we have disconnected her phone and we're unable to verify her identity any other way. Passport has expired and only has paper driving licence. What can i do? who can i call? Any help would be greatly appreciated.