I've done it for the last 2 years but sadly can't make it this time. It's a great route!
From vague memory, the approx route is something like: Caton, Crook O Lune, Halton, (towards Nether Kellet), Over Kellet, (towards Arkholme), Wray, Mill Houses, Low Gill, over the top of the moor and down into Slaidburn, Dunsop Bridge, Chipping, Oakenclough, Street, Quernmore and back to Caton. No warrantee given or implied as to the accuracy of this - my memory, like my legs, ain't what it used to be.
Quiet roads, good scenery, large turn-out, good company and cafes, and the organiser is a true gentleman (and mighty hard to keep up with on the hills, chapeau to him).
Thoroughly recommended - slap on sunscreen for the moor crossing and enjoy!