This isn't an immediate issue, but...we have been able to overpay our mortgage, and it should be clear in two years (we're in our 50s, but with two expensive student children to support).
The current interest rate is 2.5 per cent and we have a large overpayment reserve, which we can dip into if needed - that's why any spare money has gone into the account as savings rates are so low. We have virtually no money in conventional savings for this reason.
I like the thought we effectively have access to a low interest rate source of funds if needed, so I'm wondering if it might be best to slow down the payments and keep a nominal amount there even if it could all be paid off? On the grounds that if we needed to borrow money, this is a cheap way of doing it.
Or is it best to clear the mortgage and put the spare cash in ISAs?