Great job Pete. Looks like a nice route. Did you go to the castle is Warwick? I was thinking about a trip to Stratford on Avon which could take on some of your roads.
The route was good. I tried to look at the castle but it's a bit hemmed in by buildings - best view is as you cross the river, but I didn't stop. Cycled along the canal towpath for a mile or so at Hatton Locks - 21 in total, although I didn't pass that many.
I've just been comparing our 2 long rides - although yours was longer, mine was hillier - and I set off earlier when the temp was nice and cool. I used an external phone charger (see Anker pic) which worked well. I wish I'd have mounted my phone on my handlebars, which would have saved getting lost in Warwick and towards Birmingham. I might try following a Strava recorded route next time.
Knowing I was doing a number of trecks, I splashed out on a Garmin. It's a bit funky and can be really frustrating at times but having a low powered device with a full set of local maps is great. Not sure if you need data for the Strava recorded route.
The Strava map seems to display even when you've not got a phone signal, so it must store the data locally I think