In reply to Adam Long:
Thank you. Funnily enough we stayed at the campsite but I didn't know this was where Bill could be found. We did mention it to the lady at the campsite though so maybe he will hear of it. I hope they find a replacement for his invaluable service.
I wonder if there is anyway of putting up signs on routes where there aren't bird bans to warn people that there is a nest. I know I for one would not climb a route if I thought there was a nest even if the bird nesting wasn't deemed endangered enough to warrant a ban. Maybe that would be confusing I don't know.
We did originally mark that there was a nest on the route with climbing tape on the rock at the start to warn other climbers but when we woke up this morning we had a pang of littering guilt and went and removed it.