As I've always liked islands, St. Agnes looks ideal! It's the most southerly populated island of the UK (the Channel Islands are further south of course, but they're a Crown Protectorate, not a part of the UK) and so represents another extreme - The St Kilda trip visited the most westerly islands of the UK (if we -perhaps- ignore Rockall for a moment!). Maybe this event will feature less vomit than my last extreme one, but should be no less fun.
Meet at the above co-ords at the south tip of St Agnes at 2pm on Saturday the 21st of June 2008.
Further details to follow - I suggest you add this cache to your watch list if interested, as I'm adding information as notes on it. There is also a UK forum thread about the event.
Here's some information on how to get there.
And here's some more! I suggest you book early.
An additional treat for Trig Point fans is what I believe to be the UK's second most remote TP, on St. Martin's. There are also a good selection of geocaches on the islands.
There's also a bonus event on the mainland for the Tuesday evening following this: From the Beyond to Penzance, 24th June 2008. Many thanks to the organisers of it :)