I have read on the Parkrun web site about the runs and they look really good, but how is the run time calculated? It says for better runners to start nearer the front and others further back, and form one video I saw, the starter shouted 'Go' and everyone went off at once. That part I am fine with, but does everyone's time start from the time the starter said go, or when they cross a certain point? If the timings start for everyone at the same time, surely slower runners have a disadvantage before they even start, as will have a few metres extra to run than those at the front of the pack? Also how do is the time recorded at the end. It says something about 'tokens' but what are these? Sorry for so many questions in one, but am curious as to how it all works. And is there anyone that goes to Tilgate Park Run (Crawley)?