In reply to AndyE9:
Here's the relevant excerpt from this fantastic witty article:
http://www.ukclimbing.com/articles/page.php?id=37
"SEA CLIFFS
1.When abbing in to sea cliffs and carrying a rope, it's a good idea to knot it more tightly than usual.
2.Besides loose ropes, the sea also like to eat cameras. But you can claim them both on your household insurance.
3.Insurance companies get confused when you put "Stance on the second pitch of abseil" in the box asking "Where were you at the time of loss" in the household contents claim form.
4.On tidal cliffs, do the low-tide climbs when the tide is going out and the non-tidal ones when it's coming in, rather than vice-versa.
5.Tide tables are always in GMT but between April and October your watch isn't.
6.If your prussik loops are always clipped to your harness you won't ever find yourself at the bottom of a cliff in the dark with the tide coming in wishing you'd taken them out of your rucksack and clipped them to your harness this morning.
7.Seagulls know what a vendetta is and will happily give demonstrations.
8."Following the chalk" can be a mistake on cliffs which are frequented by seabirds.
9.Take care how close you get to the sea when having a pee, especially if there's a swell.
10.Left alone, uncoiled ropes always seek out hidden pools of water."