In reply to jack_eadie:
If your dad manages it all the way up and on to the actual Cioch he will, I am sure, readily manage the scramble up Eastern Gully. As I recall the only awkward bit is thrutching yourself through the chockstone tunnel. An adjacent but harder short left wall bypass is possible with security of a short rope perhaps. So with assistance I see no probs for someone as fit and experienced as your dad.
However I have seen scramblers reach an impasse at the V Diff 'bad step' on Alasdair's SW Ridge which as you probably know is easily sidestepped using the chimney just a little down and close by to right of it.
Wallworks would be a great route also but might slow the day up a bit?? Spoiled for choice really!
I would only attempt these routes with a decent weather forecast, mainly because it would make for a quality day out and one to remember.