I (Nat) squeezed down through some dodgy loose boulders at the entrance, but could not get further down safely. I could see beyond the boulder choke that there was a vertical shaft, smooth-sided, which we measured by Disto as 2.7m deep, probably landing onto a gravel floor as judged by the sound of throwing rocks down. This vertical shaft appears to turn a corner into a rift heading South-West (downslope).
No noticeable draft, but it was hard to get my head right in. The shaft is definitely big enough for a person to stand in comfortably. With a bit of tidying up the big loose boulders inside the entrance, one could get into the shaft and see where the rift goes