Thof, have a look at my routes on
OS Explore. Hopefully this link will work. Click on "see all". The routes are a bit of a mish mash, as I started playing with OS Explore before I had any ideas about using it in this way, and I can't seem to delete any. At least all the paths I have used are passable. Ideally you need to work out these routes on the Explorer 1:25000 map to go out and run them. You'll find a few places where I've shown a route and none is mapped - there is generally a path there, or it's open runnable land, but with the OS Explore at 1:50000, the line as wide as it is and the high density of paths in certain places you'll need to keep your wits about you. These routes are only a tiny fraction of what is possible in the north Chilterns.
Feel free to join us at Tring any time. This is the time of year to do it, before the evenings get dark and we get the head torches out - don't wait until August if you can help it.