The accident has been reported in the UKC forums, with user dunbarbiker commenting:

"I was one of the climbers, We were a group of four, 3 on a belay ledge and myself leading, just before the box I pulled myself onto a rock and it dislodged, creating a large rock fall. the two members airlifted are recovering in hospital with serious leg injuries. Me and the other managed to ab off safely. Big shout to mountain rescue who did a fantastic job along with the RAF helicopter."