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I found there are so many mildly different gpx files out there that there was quite a lot of natural variation in routes once out of London. Was a bit unnerving at times as my partner and I would occasionally split off from everyone else down pitch black lanes.
Also, sat in a bus stop (Or bandstand, can't remember) somewhere near Dunwich having a sandwich and watching the 50/50 split between riders passing to our left/right. Then lost riders asking us "which way??". "Both!"
I made the mistake of following red lights that went the wrong way a couple of times