It was an interesting experience but not one I'm racing to repeat now I live somewhere closer to the real thing! It's a pretty odd pastime.
Top tips:
1) Rack is probably going to consist of a single piece of pro - ie the warthog. minimum 2 for belays plus runners. Often placed in old slots and so easily removed by hand, which never inspires confidence. Apparently the size 10 hex occasionally sees some use too.
2) Let the coastguard know before you start otherwise you may end up being rescued.
3) It's really steep. Never really less than vertical, save for the first pitch of Dry Ice (Mick Fowler's famous chalk debut) which is nice, but the top pitch wasn't there at all when we went - just tottering loose crumble rapidly exfoliating....hence the ab off and run away technique (we got quite good at this)
4) The hard routes are really tough, way beyond my limited bravery / ability. A friend did ?Monster Crack at Beachy Head, the top pitch involved unprotected climbing up flints embedded in overhanging chalk, and was described as "wild".
5) Long ropes are needed - the top 5m of any route are desperate unprotected choss hundreds of feet above the deck; belay well back from the edge (like about Chigwell).
6) Salt water and chalk trashes your winter gear; wear gardening gloves, specs, helmets; take an ordinary household hammer as a third tool for warthog bashing too. Wash everything like crazy afterwards and remember you look like Jon Pertwee at the garage on the way home.
7) As the route name suggests, Careless Chalk Costs Lives...there's a Chalk supplement that was available a few years ago, not sure if it's still about.
8) In retrospect, I wouldn't advise it unless your winter grade is routinely V and above (which mine isn't). But you can have some fun playing around on traverses, in which case all you need is two tech axes and some crampons. The disadvantage is the lower 20ft of the cliffs is often slimy, green, horrible nastiness (the rock improves in the middle before the terrifying top-outs). There was a place at St Margaret's where you could set up a top rope in some old coastal defences but not sure if they've fallen down yet.