In reply to Man city:
The other thing to be aware of when climbing at Shipwreck is the tides, the Mermaid Wall sector in particular has a short tidal window and remains inaccessible even at low tide with Neaps, low tide height needs to be 2m or less to get to Mermaid wall with dry feet.
Access window for that sector varies a fair bit, but is never more than 5 hours even on a Spring low. Check tide tables closely to maximise your opportunities. The hard stuff in Shipwreck cove proper has a longer tidal window, and Castaway cove has a few mid grade things that don't get cut off quite so quickly.