I used them earlier this year and they could certainly not be described as being under used. They were full on both occasions we tried and didn’t bother with a third attempt as app said waiting.
Looking very unloved though tucked away in a small area out the back. No sign of any new developments, including anything recently added.
A couple of other (probably slower) chargers in main car park. Thay might give the pub/restaurant a bit more trade. I don’t know what site owners T&C and timeframes are, but it wouldn’t surprise me if they don’t bring much to the site owners, especially since CP over the road has such an extensive charge setup that may have reduced usage for those more willing to spend time/money on site.