I , originally did have the idea to mountain bike the coast to coast, next year which is still possible as well as the double as mentioned in the other post.
Although, this is not new stuff to me, being a long time coast to coaster. I've done the double coast to coast in 1993, done the C2C 7 times, most of it there and back, can't remember getting the train to Whitehaven. The best coast to coast is Wheelwright's, super route, bit hard going over the mountain passes, esq Black Sail. The following route is the inspiration of the Wheelwright's.
I've also walked the Coast to Coast 6 times, always camping it. i guess it's getting a little overcrowd on the path nowadays and this is the reason, why I'm returning back to my cycling touring after years of absent from it. I tell a lie, I did a short tour of the North Pennines the other year.
Anyway, this the Coast to Coast MTB route. There are some Lakeland Passes and some of it does run long side the Wainwright's walking route, but it is on bridleway's.
St. Bees - Egremont - Ennerdale Bridge - Croasdale - Ennerdale Valley to Ennerdale.
Ennerdale - Scarth Gap Pass - Honister Pass - Borrowdale - Greenup Edge - Grasmere - Great Tongue - Grisedale - Patterdale.
Patterdale - Hartsop - The Knott - High Street - Loadpot Hill - Keld Head -Bampton - Shap - Oddendale - Orton - Mazon Wath - Brownber - Smardale - Waitby - Kirkby Stephen.
Kirkby Stephen - Barras - Tan Hill - Keld - Muker - Gunnerside - Reeth - Grinton.
Grinton - Marrick - Richmond - Brompton on Swale - Catterick Bridge - Bolton on Swale - Danby Wiske - Ellerbeck- Osmotherley.
Osmotherley - Scarth Nick - Scugdale - Raisedale - Urra Moor - Lion Inn - Glaisdale Rigg - Glaisdale - Grosmont - York Cross - Fylingthorpe - Robin Hood's Bay.