In a similar but opposite boat. My partner needs to pay off half...

In a similar but opposite boat. My partner needs to pay off half her UK mortgage some time in the next few months. Looking at the chart doesn't look like we could have picked a worse time. Bite the bullet now or hold off a bit? Can someone maybe point me in the direction of some worthwhile reading on the outlook? Based on the last poster's advice, maybe sooner is better than later