In reply to leon:
Mousetrap and red wall are both non tidal as is yellow wall.
I've never bothered to check tides when going to Castell Helen which I guess means the small ledges and things down there are non tidal.
Failing that you could always abb to the mid height ledge and do true moments/freebird or the main pitch of north west passage or something.
Not sure about Kalahari, not done it. Think the traverse to get to the start might be a bit more tidal but that's half remembered beta from other people so may be unreliable.