Hi Shivan Gupta,
Under the UK-India Double Tax Convention, NRE account interest taxable in the UK can receive credit not exceeding 15% for Indian tax even if this has not been paid.
UK tax relief not exceeding 15% is available for ten years from the opening date of the NRE account per Article 24(5) UK-India Double Tax Convention.
UK/India Double Taxation Convention
NRE interest income should be declared within an in individuals UK self-assessment return.
Thank you.