UK and Foreign currency interest from a UK broker

My UK based broker pays credit interest on uninvested balances in both the UK and the foreign currencies. The broker claimed the "Client money is held at banks both within and outside of the UK" and i am not sure which currencies/portion of my balance kept in UK banks or oversea banks. I'd searched the previous threads for those people got the same issue i.e. people who got the "Foreign currency interest from a UK broker" but there is no straight answer for us to report these interests through SA100 or SA106 ?? Many thanks in advance.

Hi EEE,
If no tax has been deducted, you can declare all under UK interest.
Thank you.