Hi Sean, Red Grouse are a bit tricky in that part of Craven as there isn't much in the way of heather. Pen-y-Ghent may be your best bet in the immediate vicinity. If you head east, beyond Skipton, Embsay and Barden Moors are your best bet. Or you could west into the Forest of Bowland.
Black Grouse are a different kettle of fish. Attempts at re-introduction around the Hawes area have been, apparently, fairly successful although I'm not aware of the location. The only reliable site that I am aware of is way up Arkengarthdale, beyond Reeth.
East of Settle along the A65 is Hellifield Flash. Well worth a look as open water bodies are few and far between in that part of the world and it's had a few good birds.