Thanks for the positive comments. I did my homework prior to the day, with the aid google maps etc. I chose a traffic island where the riders past after about about 10k, and then the other side of the island a few K's later, giving two bites of the cherry, so to speak. Standing on the island allowed head on shots as they swung onto the island.
Despite my best efforts, many shots were ruined by someone "suddenly appearing" in the background. Most annoying was a guy in a high viz vest that ruined what would have great images of Cavendish, Kristian House and Quintana. If he had decided to deliberately keep moving himself into shot as a rider came past, he couldn't have done a better job.