In reply to Gordon Stainforth:
Jomo is a terrible suggestion, in the latest Lancs guide it is given Severe and done in one pitch, and the start is described as feeling hard and bold, which as I did it on Sunday, I would agree with, and as there is no gear in the first pitch, not much use to learning to lead.
As to Langdale, which is my second home in the Lakes and a beautiful place and a great place to climb, but not super local to Preston, though we have climbed there of an evening.
Wilton 1 is a very poor suggestion, however Wilton 3 is a decent place for a novice with some easier well protected routes, and as I spent an hour chatting in the sun on top of the crag the other week, can say with certainty that the views from the top are very very nice, but in the quarry itself, not so grand.
Cadshaw is a sweet little spot, overlooking a stream, take a picnic, and easy to do several routes and get plenty of leading practice in, and as a natural outcrop, a little less usual for Lancashire.
Hutton Roof is gorgeous and gives stunning views into the lakes, and again easy to do several routes and get plenty of leading practice in.
Preston is a great place to live as a climber, with plenty of climbing for evening climbing available and some sublime countryside in the Trough of Bowland and elsewhere very close at hand.
Also if your friend fancies a bike ride, The Guild Wheel is excellent.
Denham, hmm, lovely views from the top, and Splash Arete is excellent, a contender for best V Diff in Lancs, but TBH Denham is not my favourite venue.