Yes, it depends on how easy it is to pump money in to the mortgage without ERC relative to how much savings you have and any withdrawal restrictions. In my case I had no ERC and instant access to the savings so if rates turned against me I could pay off the mortgage the next day.Correct me if I'm wrong, but the fact that only one of those interest rates is guaranteed for 5 years is significant. That's because the savings interest could plummet back to 0.25% after say 2 years, then I'm not only stuck with money making nothing, but I'm unable to drop it all into my mortgage due to ERC, plus I'll have lost the first 2 years reduction in the mortgage balance.
Keep in mind it's unlikely the MPC wakes up on a Thursday and says "right boys lets knock 4% off the base rate", you can usually sense it coming and it's invariably a gradual fall rather than sudden fall, giving you a bit of time to react.
It also works both ways - if interest rates go up, and you had been paying off the mortgage instead of saving, that's "dead money" that you can't then put in savings to achieve the higher savings rates as you missed the opportunity. Having money in savings keeps you in control, i.e. high savings and high debt is more flexible than low savings and low debt.
Key info we need is what your ERC are and how much overpayments you can make without incurring them. Sometimes they are tapered so the ERC is actually not that big towards the end of the fixed period.
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