In reply to two_tapirs:
As others have said, Halldrine is easy enough to set up a top-rope; there is a little bit of faff to locate exactly where you are in relation to the climbs, so it'd be easiest to have one of you at the top setting up and the other already at the bottom to guide them. Do pay attention to the state of the sea: especially if you head toward the left side of the crag, beyond the black slab, the approach scramble does get a little exposed.
If you want some extremely straight forward leading then Alison Rib is a classic (thoughthe final pitch has a tough little wall with an off-width crack that's tricky to start). The right hand routes at Halldrine are excellent for practising leading on; try Nursery corner and then Barnaclet or Geological Groove - they're all very straight forward and, despite being ona sea cliff, you can always lower to the staring ledge (or even escape rightwards).