Update from Miles:
Just letting you know that there has been a fall at the top exit in Rhiwbach (the main exit, not the airshaft). The brow high above the gate has come away and there is a pile of fresh debris on the floor. You have to climb over the fall to get out.
There is still some loose stuff up on the brow, a few rocks are still waiting to come down.
No doubt a result of ice thawing.
Although it’s not massive, I would recommend closing that route until it settles down. If someone could abseil down to the brow from above, I bet a lot of the loose stuff could be knocked out.