Nationwide mortgage overpayments - 10% per rolling year or year since opened?

I can't seem to find an answer to this anywhere in the T&C... I have a fixed term mortgage with nationwide taken out a year ago, overpayments are a maximum of 10% 'per annum'.

What I'm struggling to understand is if this is a rolling total, i.e. 10% in the last 12 months, or if the 10% limit resets each anniversary of the mortgage being taken out.

i.e. If I took out the mortgage in April 2020, and had made regular overpayments, would I be able to top up to 10% in March, and then continue to make overpayments in April, or do I need to keep an eye on the rolling total for the last 12 months to make sure that in any 12 month period I don't exceed the limit? 



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