If heading up to Northumberland, can recommend the following route: Kirkby Lonsdale, Sedbergh, Kirkby Stephen, Brough, Middleton-in-Teesdale, Stanhope, Blanchland (Northumberland) - lovely village like stepping back in time - held in trust for many moons, same owners as Bamburgh Castle.
Some of the route is single track and broken surfaces, so take it steady and watch out for the mobile wooly jumpers.