Continuum 2006 (http://www.continuum.uk.net/) is at Beaumont Hall, one of the Leicester University halls of residence, from July 28th to 31st.
Looking through the site, there's an excellent line up of games: huge amounts of HeroQuest, plus Paranoia, Call of Cthulhu, etc, etc. There are some superb LARPs (or freeforms, call them what you will): if you can get a place, I'd highly recommend them.
On Saturday night, I'm running my LARP "Too Much Rock For One Hand". It was inspired by listening to Bat Out Of Hell on a six-hour car journey and it's become a game about rock, sex and bikers. It ran a month ago at MayCon and went really well. Do come if you can.
Graham