This is a vid I got of a trial from Knabb Quarry in Matlock in 1999 that I competed in. It features Martin Hawes, Chris Akrigg and a few other riders on a few of the sections including a waterfall section.
The quality isn't brilliant as the vid is 13 years old and hasn't been played for probably 12 years and the VCR hasn't been used for about 6 years but it's as good as I could get. I'm gonna see if I can dig out the results later and get them scanned and posted up along with the cover letter for the vid stating which riders are which.
For all you youngsters you'll notice the use of the bashring by the elite riders, this was allowed at the time along with stuff like the fact 26" bikes had to have a full set of useable gears at the back!