HI, the shows are great, although I think excel is the best one around at the moment. I went to olympia this year and it was really bad, hardly any of the big names were there, and I heard from my local supplier that they are just going to concentate on excel, so maybe in the future they will stop doing olympia.
here is a link for events, hope you find it useful
BeautyServe.com :: The world of professional beauty, nails, tanning & complementary therapies at your fingertips.
also another link for the guild, although you might already belong to them, but if you join, they provide your membership and insurance, and then they send you info for the shows which you can send back, in exchange for free tickets.
Beauty Guild : Beauty
also just found this one, and I'm really pleased with this.... cos they used to do shows in brighton years ago and they stopped but looks like they are doing another one. (although after looking at it, you might have to belong to babtac!)
BABTAC.COM - The Official Site of the British Association of Beauty Therapy and Cosmetology
hope these are helpful, gives you something to get started on lol!!!
they also hold shows in scotland, I think next one is may 2009, birmingham,... maybe other ppl will know where the others are, I've only been to london and brighton ones so cannot comment on others.
good luck x