Having held events at Britain's highest, most westerly, northerly and southerly points, (plus England's most southerly) at last I go way out east, and invite cachers to join me on at the extreme end of Lowestoft... You may find this link helpful, but not so useful now as it once was, since I've shifted the event a bit to make it safer.
In addition to the above, I also currently own Britain's most westerly cache, most westerly physical cache, mainland Britain's most westerly cache, England's most westerly cache, Britain's most northerly cache and its most southerly...
When: Saturday the 14th of May (carefully missing Friday the 13th - no need to tempt trouble!), at 1.30pm (BST, 12:30 GMT) - Low tide! The event will run for a MINIMUM of 15 minutes at the given - updated - co-ords. While not intended to be a flashmob event, this is an explosed location and the weather may make it unpleasent to stay on site longer... I also intend to walk out on the breakwater just to the north of the event but this looks pretty slippery and IS NOT required to log this wheelchair-friendly event as attended.
Where: The edge of Lowestoft in Suffolk - Ness Point - at the given co-ords. There's a circular feature you shouldn't be able to miss while walking as far east as you're able while still keeping your feet dry.
What: A classic out-door cache meet, with coin and TB swapping and chat about all things caching. It's also at lunch time, so bring a sandwich.
Who: Cachers from far and wide, but an event of special interest to cachers who enjoy their 'extreme' caching (geographical) such as myself :)