Reporting interest on personal savings

I am in full time employment. I do not receive a pension. I do not complete a self assessment form and according to the HMRC questionnaire I don't need to. My question relates to savings that I have in UK banks which I believe will be subject to tax: Do I need to do anything to report my savings to HMRC or will that be done automatically by the financial institutions which hold my savings?

Hi Orson Cart,
UK banks and buikding socities notify HMRC or the interest received.
If there is any additonal tax to pay, a calculation will be issued to advise.
Thank you.