Hi,
Article 11 of the UK and Hong Kong double taxation agreement states that interest arising in Hong Kong and paid to an individual, who is resident in the UK, is taxable on that interest in the UK.
2010 Hong Kong-UK DTA
There are no tax implications for the transfer of your savings from Hong Kong to the UK. Any interest that arises may be taxable.
Please have a look at the guidance at section 9.11 & 9.12. If you meet the criteria here then, you do not need to declare the interest. If you do not meed the criterial, the foreign interest must be reported on a Self Assessment Tax Return, even if there is no tax liability.
Thank you.