Thank you Eds for sorting it out ;) What I did'nt say though was that the written word is all very good for stirring a rant but a more proactive result and a more positive note can often be seen elsewhere. Voluntary work restoring cairns and pathways are also happening - think Heather and Hillforts Project, the restoration of cairns on Dartmoor, Cornwall and on some of the Welsh hills, its not all bad news.
North Yorkshire moors could also be protected by local societies, local people who love their own landscapes, I presume there are rangers for the National Parks on patrol, and maybe some 'strict' signage at the car parks or pull ins could address the problem of wanton ignorant behaviour......
"you will be hung, drawn and quartered should you so much as move one stone away from a B/A cairn"!
I checked the Ramblers Assocation blurb and it does not seem to address any damage to scheduled monuments, but perhaps ramblers are well trained as a group.