Does cashed in part of Index linked savings certificate need to be declared on SA return?

Dear HMRC. I have an Index linked savings certificate with National Savings & Investments which I partly cashed in during September 2023. Does the amount cashed in need to be declared on my return and if so, in which section would I do so, please? Kind regards,

Hi,
It would be declared in the dividends and interest from UK banks and building societies section boxes 1 or 2 on tax return page 3 if a paper tax return.
If you are filing online, on the tailor your tax return page 2 of 3 answer yes, to the question Did you receive any interest, for example, from UK banks, UK building societies, UK unit trusts (or untaxed foreign interest up to £2,000)? This will open the section online to declare the details. 
Thank you.