Foreign Interest and Personal Savings Allowance

I am opening a foreign bank account for my UK resident daughter (under 16). Am I correct in understanding that even though she will earn a nominal amount of interest from it (well under the Personal Savings Allowance) because it will be foreign interest she will need to declare it. And I will need to register her for self assessment to do so? And that the only way to register a minor for self assessment is via post? Thanks a lot.

Hi,
Yes, that is correct.
Thank you.