Need to change email on old account - Self Assessment

Hi I had an old account set up for self assessment, have not had to do anything with it for some time as was not filling in SA forms. Now need to sort SA again. Problem is my old account with Government Gateway is still active but the email attached to it is not valid any longer. I closed this email some time ago due to a potential scam. How do I change this email, I don’t have my old GG ID and cannot receive emails in the old email address as not valid any longer. Hope this all makes sense.

Hi,
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Thank you.