If you're delving into the world of Strava, the only extra word you need is Veloviewer(.com). Stat geeks of the world unite!
I tried the airplane mode and it worked, thank you. Can you record multiple journeys that way?
And today I was taking a route across a bit of common rather than the road, and I was wondering if it saw that as a different route than the road some 30 m to the left of me? Or in another place I take the road where most cyclists stay on the cycle path, but that's only a few meters apart.
Your GPS track will almost certainly pick up your common detour; it works on (almost) second-by-second GPS co-ordinates rather than following road mapping data and making assumptions that you're on it. Unless your GPS signal there was poor for some reason, in which case you'll get the rather unseemly straight-line 'jump' between the two points where GPS was able to catch you. Same with the road/cyclepath situation.
This is only true of the GPS route track though. When segments come into play, if you cross a start point and an end point it will assume you rode the segment as specified by who ever established the segment. Meaning that if there is a short road A-B which is an existing segment, and there is an alternate slightly longer route via C which you take, it'll throw your A-C-B effort in with all the other guys (and gals!) who have straight ridden A-B. If that makes any sense at all.
There is a tolerance to that; if A-C-B is significantly bigger then somewhere in Strava's algorithm there must be a cut off that says "they've blatantly not rode A-B so it shan't be logged as an effort", but I have had A-C-Bs (if you're still with me) of sometimes 2-3 miles extra which get lumped in with the A-B effort.