It didn't disappoint.
I attach a few photos.
It was 1 deg C outside but more like 8 or 9 deg C inside the passage, with lots of water dripping in from recent snow/rain and very high overall humidity.
Not great for the camera, but it survived.
Being confined, damp and dark it reminded me of caving in the Mendips in my youth.
Stoney Littleton is interesting as the 4 or 5 degree slope means the sun doesn't rise over the horizon until about 45 minutes after proper sunrise.
Unlike Maes Howe or Newgrange, you can get to see it without booking or company.
I hope this solar alignment business isn't catching !
Click to enlarge. Photos (c) Stephen Cogbill
For more on the alignment see Silent Earth and Terence Meaden.