Dreadful. One favourite bit has turned from singletrack to streambed.
Looks fun, even if it is a bit wet.
It did prove that you don't need to worry about grip on wet millstone grit. The Nics held up very well.
Which version of the Nics do you use? My OH's bike came with some on it, and I don't like the feel of them as much as my MKs, so I suspect she has the cheap version and they need upgrading.
I use their Snakeskin Evos, 2.4 on the bouncer, and 2.25 on the Cotic. They work out at about less than 30 E each delivered from Bike-discount.de I run them tubeless on Stans rims at low pressures. You can see how rocky Calderdale trails tend to be.... that one's about average for Norland, and so tubeless lets me run low pressures without snakebite.