I did this in May too. Superb fun - even in the wet.
As K said, the time flies! 1-2-1 was definitely worth the dosh. I would hate someone holding things up in this situation (or to hold someone else up!!)
I was buzzing for an hour afterwards - then promptly fell asleep (too much adrenaline!)
Some pics here if you're interested:
http://www.greeno76.com/thumbnails.php?album=39
Have a great time on the 27th!
J