Watched part of the bike course, and the amount of traffic looked scary, as you came back towards the bridge having been up to Marble Arch
The long right hander just before the bridge with the run heading towards you , and guys on full out TT bikes going flat out with people on hybrids and the like with no idea about cycling etiquette,
saw one guy on a gorgeous Trek Project One slide off trying to avoid an huge guy on a Boardman hybrid who just moved over on him after he had committed to the corner in full aero position