Strava Heat map:
Visualization of uploaded Strava files: http://i.imgur.com/ieAwCli.jpg
Interactive HTML version: https://drive.google.com/open?id=0BzH-so2yTtR9QUJYamQ4clUtcEk (download and view in a browser)
Great, thanks for all the effort. So looks like the data is complete for the section Laz was monitoring them but pretty gappy before then? Hmm.