Many thanks for your responses, I'll take a look at those avenues suggested. I guess i completely overlooked the fact that UAV's could be 'normal' sized aircraft thinking more along the lines of aircraft like the Zephyr (HALE UAV).
I suppose it makes sense that they should comply with the rules manned aircraft have to but i don't see the argument, 'who could ATC vilify if a clearance wasn't met?'. Surely the UAV operator (ie the pilot) would have to accept responsibility for the aircraft and any hiccups that occur as they although not in the machine are controlling its actions. Can't tell the puppet off only the puppeteer.
