Some good detective work there Will. If you do some digging on Strava / Suunto Movescount you can see the routes we all took, myself and Rob decided to add a little on, think we clocked 7.93 miles after turning back once we'd realised we'd gone wrong. If you care enough then all the routes in question can be found on Strava / Movescount. Some longer some shorter. I am a little surprised about the results and a few decisions that were made.
How come you weren't running?
Hope you're well