In reply to J1234:
> .. do you have to pay to get better info?
You do. The OS maps ('Landranger' 50000:1 and 'Explorer' 25000:1) are on the 'subscription only' side, as are the details of the routes and the aerial 3d thingamabob.
Subscription costs about 20 quid a year, and among other things allows you to print your own OS maps to scale (on A3 or A4 paper). I was just rummaging through some of the routes on there yesterday as it happens. Based on my local knowledge of the routes around here there is some very good stuff mixed in, inevitably, with some dross as well. They invite people to rate the routes from zero - five stars and you can filter by ratings which helps a bit with the signal-noise ratio.
You don't have to pay to try it out though, there is a free 7-day trial you could use to have a good look at it. (Or print out a big stack of maps.) I was just about post here and recommend that the OP should perhaps give it a try.
Post edited at 12:44