In reply to gazfellows:
When I have been there, I have always used the parking at 51 deg 38 min 46.14 sec N, 4 deg 45 min 54.05 W. Facing the sea to the south, there is a path at the RH end of the car park. Go straight ahead down there for about 180 m until you meet a path at right angles. Turn L. Mother Careys Kitchen south face is about 200 m down here on the RHS. From the top of the cliff here, you should be able to see a very pronounced right angle corner over to your right, facing out, with a bay on your LHS curving around to a series of seaward slabs.
I'll email you a screen capture from Google Earth to show you where I think the top of the South Face is.
We always abbed down Brazen Buttress. It is a popular route so please check there is no one on the route first ! I can't recall if there are stakes in place.
Andy
Post edited at 14:00