Hi
Usually our systems automatically review your tax records for any tax repayment due over the next few months. If you have also recieved any employer benefits/Jobseekers allowance /Incapacity benefit we may still be waiting for this infomration to be passed on to ourselves.If you log onto your personal tax account it may now showing if any tax repayment is due.
Please see link here for further information
Personal tax account: sign in or set up .
If still unclear you should contact HMRC using the contact details here for further assistance
Income Tax: general enquiries