Can't comment on last year Philip, but I ran it in 2000. I had a really bad day and instead of doing a predicted 3:45 I really bombed and was way behind schedule at half way and got worse - finishing in over 5 hours by the official clock. I had no problems with Locozade Sport (ok - it was Liquid Power that year, but assuming they're working on the same quantities...)
I carried some in a drinks bottle just in case I wanted some in between the drinks stations, but didn't use it.