telling us that as we had been maintaining the set payment figure for a long enough period of time we would now be switched back to just having to pay 3% of the balance....which is roughly the same as what we're currently paying - but obviously the 3% will create a smaller figure as time goes on so if we do have a "tight" month (particularly while I'm off on Maternity leave) we can just pay the minimum payment.
Still got a LONG way to go on it but it still feels like good progress from just under 2yrs ago.