I messed up. Because of something going on at work that needed me there super early in the morning, I stayed overnight in the big smoke rather than commute in. This gave me the opportunity to rent an e-bike and cross off a few extra tiles on my London cluster.
I carefully planned my route on Strava, took my Garmin with me, but forgot to actually upload it from one to the other. However I was pretty sure I could remember the route as most of it was following cycle routes and I'd previewed some of the junctions on Google Street View. And it went quite well - I didn't think I made any obvious wrong turns and got to the end of my route successfully. Until of course I uploaded it to Veloviewer and found I'd missed a turn (or possibly made an extra one I wasn't meant to) and now have a gap in my map.