Android phones, apps and tablets

you wouldn't be able to watch a film otherwise and maps stays on, is there not an option in Strava settings?

Not that I could find. I think films/maps register as the phone being 'in use', whereas Strava does not. Anyway, I've installed Caffeine, so that should do the trick. It's annoying, though, and not really necessary. iPhones have it as a standard settings option. Can't be difficult to include.