I'm thinking of a UK tour taking in both scenic locations as well as seeing family and friends.
That's a pretty big tour you seem to be contemplating!
A couple of things that may help you along.....
Cycle.Travel has a newish feature that allows us to add our own 'Markers' (Points of Interest) to the map. In your case, add in the people you want to visit, the places, perhaps particular routes you want to cycle etc., each one with a different icon and then set about joining them all up together in the most interesting way. It really is a very useful feature.
You can also change the underlying map to more clearly show 'official' cycle routes and the plotting engine can be instructed to follow these as much as possible.
Above is one small section with campsites marked off as well as some bike routes ready for wandering.
Cycle.Travel also has its
'Route Guides' option with detailed info (and maps) for a variety of long and short routes.
CGOAB has its 'map' feature giving direct access to journals by location. Useful for inspiration and info.
Any ideas of places to see etc.
I'm sure you'll get more responses when you focus on a particular area.
My genuine advice would be to focus in on the 'who' or 'where' you really want to visit then set about plotting a route to navigate between them. My understanding is that this tour might be different to previous ones, something that can be shied away from or embraced. I suggest embracing the difference.
Good luck!