The less rules the better. If we can have a smart way to improve safety without impinging on the simplicity and comparative freedom of fell racing, then that gets my vote. Not done a park run but am familiar with the idea. Does it work? Can you scan the code with barcode reader in a mobile phone? And then send the data to race hq?? If so it would be neat way of tracking runners on a long race. Then perhaps we would allow topless runners with felt tip numbers on the back of hands for v short races. Nice and simpe!