In reply to PhilWS:
Hi Phil, so 11 and 13 is a bit too big for lowering, so what I did with mine at that age was to set up an ab, have them on a safety rope as they ab in, they disconnect from the ab rope at the bottom remaining tied into the safety rope which is now the top rope, they then move to the selected route which is within metres (there is a ledge on both crags but can be tidal)
You are directly above so top rope them out. That way they always have a rope on, they can see you and you can talk them up and no need to commit all of you to the bottom of the crag. If necessary you can set up another belay at the top slightly further along the crag (I'm talking metres), so use one belay at the ab and when they are safely down you move to the other belay so you are directly above them
This method works for the crags I mentioned in my previous post and I've used it on a number of occasions
The only issue is that you don't get to climb!
Rob