Hi subash krishnawarriar,
If you are UK tax resident and domiciled, you need to report it even if not brought to the UK.
If higher rate, your savings allowance is only £500 and if basic rate it is £1000 and you will be taxed on the difference.
If not domicilled, please refer to
Paying tax on the remittance basis (Self Assessment helpsheet HS264)
Thank you.