"I still think that if he doesn't want them then he might be happy if somebody else was to come and move them off of his land. We've got part of the plan of what the circle looked like - I just wish I had a garden ;-)"
It may be worthwhile checking the dumped stones to see if there are any cup n' ring marks on there. If so, perhaps it'd be a good idea to alert Ilkley Museum? I'll try to get over there when I'm back on the moor soon.
Maybe a good use for the stones would be to brick the farmer's door up before he ruins anything else! Grrrrrr!!!