Interest earned over £1000

I have earned over £1000 interest over the previous 2 years. I think I have wrongly thought that my tax code would automatically change. But I now think I should have completed a self assessment tax return Can you confirm that is what I need to do?

Hi,
You do not need to complete a tax return for either year. If you are a basic rate taxpayer, the interest you earned each year will have been covered by the £1000 Personal Savings Allowance. When your interest is covered entirely by this allowance, your code will not change. You can see guidance here:
Tax on savings interest Contents
Thank you.