In reply to Trangia:
On the descent it's possible to lower someone, or let them abseil into the gully. Some of it is free hanging, so not ideal if you think they might be fazed by it. Fifty metre rope is more than long enough. If you want to let them climb down, you can protect most of the descent by flicking the rope behind a flake at the start of the descent which will prevent them swinging into space if they fall off. The most awkward part is the first few feet.
If you haven't done the descent yourself before, it's probably a good idea to scramble down in advance so you can see where the awkward bits are and at what point it's safe to take the novice off the rope. I have done a few routes on the slabs with my children. I think they were about 10 and 12 when we first climbed there.
You need to keep an eye on them on the scrambly bits from the top of Ordinary Route to the descent route. There are some short awkward steps, where you probably don't need to use a rope, but where a slip could be nasty.