In reply to BigLob:
North Gully above Low Water is a nice grade I, with other slightly harder routes to the right. There's another easy gully on the right side of Raven Tor above Levers Water, and several either side of Hen Crag on Wetherlam, some quite atmospheric. If you start with the Hen Crag routes you can easily move on to incorporate all these in a cracking day out.
Have fun,
Iain