UK Tax Questions? Ask a UK Tax Advisor for answers ASAP
Is this a question on US or UK tax?
If you are domiciled in the UK (see page 10 and from page 24 here) and resident in the UK, you are liable to UK tax on your worldwide income and gains. Any tax paid on the interest from the USA will be taxable in the UK but you will be given credit for any tax paid on the same income in the USA. You cannot choose not to pay UK tax on the interest unless you are non-UK domiciled and choose to be taxed on the remittance basis (see section 9 here).
You won't pay any UK tax on the £100,000 capital if you bring it into the UK.
I hope this helps but let me know if you have any further questions.
I can see that you sent a message to the moderator. Is there a problem? This is a very straightforward question as far as I am concerned so please let me know if there is anything you aren't sure about.