I used to go to all the UD's at Stevenage Leisure Center, really good nights,predominatly hardcore when they first started with one or two jungle drum & bass sets which were always better as you appreciated it more.
The last couple of events at Stevenage were excellent, they had both the halls open with the different genres switching every hour, bit of a pain moving rooms every hour but at least we didn't have to stand through 2 hours of Hardcore before we had to get our jungle fix like the earlier UD's.