In reply to mutt:
Depends how cold it is, but Long Scar and Black Crag on Pike O'Blisco might be a good shout. I would take indoor V4 with a pinch of salt if he's not climbed outdoors much, as it's very different. If it's too cold, then any valley crag, depending on the kid and his likelihood to enjoy or not. E.g. Castle Rock of Triermain South Crag or Hare Crags or Trowbarrow or Fairy Steps. Wallowbarrow has some VDiffs and a Severe with big ledges if you want to introduce him to multipitch in a fairly easy environment (i.e. 10 min walk-in; short multipitches; good belays with good ledges, where you can readily lower someone to the ground on a 50m rope from almost anywhere).