William Tyrrell

I have been trying to declare and pay capital gains tax but I am stuck in a loop; due to my account being set up for self assessment from when I operated as a sole trader, the website assumes I am an organisation and insists upon my providing a trust reference number. I cannot set up a new government gateway as it just links me back to my old one. There seems to be no way to get the website to process my request as personal rather than business. I have seen some other people with similar problems but none of them have had a reply with any solution. Even my accountant is stumped. Please advise.