Device requirements are nothing extraordinary:
- 95% UK based for maps
Pre-planning routes
Turn by turn navigation
Relatively short tours (2-7 days), camping off the bike.
Also able to "record" route-free cycles at weekends etc. to load up to PC/Strava/Endomondo etc.
Slight complication is a desirable requirement, as a runner, to record jogs/runs.
I've looked at Garmin Edge bike computers, but also their multi-sport watches, which while expensive can contain maps etc.