I noticed that at some time in the recent past all the underworldlive.com label material (OwB, Crocodile, etc.) on iTunes UK was upgraded to iTunes Plus. That means no DRM and twice the bitrate (256 Kbps vs. 128 Kbps).
You can upgrade your previously purchased DRM’d songs for £0.20 per song or 25% of the album price. To upgrade, on the main iTunes Store page, click the “iTunes Plus” Quick Link on the right-hand side, and then use the “Upgrade My Library” section.
The iTunes Plus upgrade doesn’t seem to have been extended to the US or Japan stores.