If you want a proper off-road Route (we are off roaders aren’t we ?):
Formby to canal at Burscough ( John Climber Moore’s Winter Bivvy Route)
Follow canal to Wigan then to Adlington (Bridge 64)
Bit of road to get through Adlington (but you can avoid most of it by leaving main road, and going via quiet residential road)
Cheeky bit to get over M61 to Horrobin Lane
About half a mile on Horrobin Lane to Rivington
Some good off road to get over to Holcombe Moor, then drop down into Irwell Vale
About half a mile through Edenfield to turn left for the big climb up to Cowpe Lowe (via Gincroft Lane)
You’re then on the MTL (Mary Townely Loop)
Head north and when you get to Hurstwood Res after half a mile head north on an excellent BW over Extwistle Moor
Follow it including Bronte Way, to Wycoller.
Then PBW to Barnoldswick, where I think it’s best to get on the canal, as far as Gargrave.
OR from Hurstwood Res find your way to go through Townely Park, and get on the canal at Burnley (only about 2 miles to the canal)
And then to Gargrave
The Dales:
Different possibilities depending:
Bell Busk, Otterburn, Settle
Cam End, Ribblehead
To get from the Dales to South Lakes will probably need minor roads, I just don’t know.
I rode once via Great Asby Scar to Orton, then west to Borrowdale (not The Borrowdale, there’s another one, good stuff too)
Hope that helps
(You did ask

)