Foreign Rate from HRMC

HI, I have some interest income in foreign currency and I know that the foreign exchange rates from HMRC should be applied. However, I found that there are yearly rates, monthly rates and spot rates. Which one I should use? or I am allowed to use any of these rates (ie yearly or monthly or spot rates)? Best regards, 

Name removed admin .

Hi,
 

You can use any of them as long as they relate to the tax year that the income arises . Thank you.