Why not allow people to start wherever they want? Based on what they think would give them the best advantage to get the most points over the day? As long as they're in the finishing point by the deadline?

Also how do people prove what buses they've been on? If I use a key card or Explorer I've got no proof that I've been on any bus? Sure I could take a photo of the fleet number as I board, but there again I could stand at Heworth and do that all day long without moving?