Make overpayments on mortgage or not Context: I am on the help the buy scheme (20% equity loan) on a £300k property. 2% rate expiring 2027. Want to buy a home with partner once that expires. House to purchase likely to be in the £450-500k range in this current housing market. Do I make 10% overpayments now until expiry of current mortgage term to lower the principal and simultaneo…