Barcud has a non-tidal ledge (it may get wet with very big tides,but I've never seen that) under parts of the main wall (kitten claws and beyond the azimuth area). From what I remember the sinecure area is accessible for a couple of hours either side of high tide. Ethos area is (I think) accessed from a non tidal ledge. All areas are easy to abseil into. If you're happy downclimbing then there are some easy routes on the rhs that can be used to access the main wall.