wiggydiggy
Guru
Thats part of a Sustrans plan in progress as a guide, they are talking of NCN66 connecting Manc to Hull but use some of their other routes and its already done.
Sowerby Bridge > Wakefield needs improving and I haven't ridden Leeds>Selby to know its quality but as a national network off roads this almost works for this area.
The only issue with the way they are building it is that a lot uses canals, and as I know canals are wonderful for a cycle ride but as a decent alternative to roads (ie fast A>B) they are not suitable.
Far better is their (Sustrans) work with old railway routes. TBH and this is despite my love of railways I'd like to see all old routes converted to shared use greenways, split the trackbed 50/50 with a fast and a slow side and we'd have a decent network of non road routes that all can use.