In reply to Baron Weasel:
Hi, I’ve been over a few times and would say that as long as the sea is calm you can cross at any tide really, just depends how far you mind swimming! A small area of the platform does stay out at high tide but it would be a long swim (20m maybe?). When the tide is in the water does push through the gap quite vigorously until about mid tide but after that the stack itself acts as a breakwater. A small blow up boat and a long rope works well for keeping gear dry.
The main constraint we had is actually a section of wave washed slabs around 100 m before the stack. At high tide you can still wade across but if the sea is rough then you’d certainly be rolling the dice...
id also second the quality of Atlantic Wall. Much safer than the VS and much more solid! The VS is good but the first pit is very bold and the first belay is dreadful!
Good luck!
S.