Soldato
Yeah I think in reality whilst a one off 5k hit sounds like a good idea, overpaying in a more sustainable way is the right answer. I believe you can ask for overpayments back in a 12 months period too, if it was to ever hit the fan.
Very much lender dependent unfortunately.
Mine you cannot get anything back that you have overpaid directly.
You can request however to have your overpayment reserve used to offset any charges, such as next 6 months repayments. Although I think technically they have to approve that.