CH146080 - Interest: Repayment Interest: when is interest not paid
You must check whether, and from which date, the FA 2009 interest rules apply to the tax or duty you are dealing with. See CH140160 for full details.
Repayment interest is not payable on an amount that is payable by HMRC as a result of an order or judgement of a court having power to allow interest on the amount.
Example
If a person is successful in their appeal to the first-tier tribunal and as a result HMRC has to pay or repay an amount to that person with interest, we do not also pay repayment interest.