If you received an email from the central PQIP team regarding your 6/12 month follow up, you should find your CaseID number within the email. If you have been invited to set up an account by the research team at the hospital you had your procedure at, they will be able to provide you with the details you need.
If you are unsure on anything please do not hesitate to contact the research team at the hospital you had your procedure at, or the central PQIP team.