Declare foreign interest below tax threshold from previous years?

Since I had to do my self assessment for the first time this year for other reasons I realised I should have already self assessed to declare foreign interest income. I've been a UK resident for tax purposed for a couple of years before this past tax year. How should I declare foreign interest from previous years? I don't owe any tax since my interest income is and has been below the taxable threshold (income amounts are below £100 for the years in question). Many thanks

Hi ,
 

If you meet the criteria for Self Assessment then you will need to register and submit a Self Assessment even if no tax is due. You can check if you meet the criteria at : Check if you need to send a Self Assessment tax return    . Thank you .