In reply to Pbob:
I once strongly suggested to some children that they shouldn't climb up some steep, fragile and damaged sand dunes (more of an eroded almost sheer sand cliff), both for the longevity of the dunes and for their own safety (Children sometimes get buried when they trigger dune collapses.) Their parents had a right go at me, and then started suggested that I shouldn't be on the beach with such a big camera and lens around children. Because nonces walk around busy beaches with big telephoto lenses apparently. So if the parents didn't have a go at you, you're probably better at handling these things than me.
> One adult told me that it wasn-t the childs fault as they didn't know better.
So - this is the miscommunication - the adult seems to think you're having a go and blaming, where as what you want to do is inform them for the future. There's a knack to rapidly noticing and explicitly correcting this sort of talking at cross purposes; I suck at it.
The other thing to consider is the child's safety - if the system was shock loaded, would the part they were touching be pulled taught against rocks? If so it holds the capability to do serious damage to their fingers. With somewhere as popular with non-climbing families as Brimham I can see parents worried by this taking action with the landowners that risks climbing access. I've only climbed at Brimham with the belayer up top and suitably anchored, so your situation couldn't then arise; probably not a bad approach to managing things where possible.
As for shouting at the child - better than having them loose a finger or damage a belay, but if it's not urgent there's probably a less-likely-to-go-wrong approach as Coel says. I've no idea what the best way to command someone else's poorly supervised small child is...
Post edited at 21:14