Hi, I've updated my signature to reflect what I'm using.
Thanks again for the advice, unfortunately I'm not in a position at the minute to buy the pocket wizard system, I've ummmed and ahhhed about it, but I've spent far to much lately and If I spend another £500 on equipment I think the wife will divorce me. I've had to opt for a cheap and cheerful radio trigger, its the Yongnuo RF-602 wireless flash trigger w 4PC receivers for Canon, which I've picked up from EBay for just under £60. It gives me 4 receivers, so a spare if something breaks, or an extra one if I extend my light kit.
I mainly work out of my studio, so they will be permanently set up, not being carted around and don't need to be to robust, I've given them a good run and haven't had a misfire yet. I think I will have to give the Pocket wizard kit more thought when I pick up another couple of 580 Exs, and I'm looking at doing more with a flash outside, at the minute, most weddings I do, I tend to bounce the flash a lot, or just use it as a fill outside, It would be nice to have a better kit for outdoor flash photography but I'm going to have to build to that over a period of time, hopefully the studio work with put some money in the kitty for that.
Thanks again for the advice, its certainly not been discounted, just put on hold for a bit, I'm sure that a pocket wizard trigger set will adorn my camera kit sometime in the near future.
Heres a video review on the system I bought, just incase someone else has a similar issue in the future. https://www.youtube.com/watch?v=s5shvFGUf3g&feature=player_embedded