Dave the two defendants in question are none other than Richard and Justin Harrison.
From Wiki:
In 1997, Richard and Justin Harrison, then owners of Hiwatt amplification UK and Music Ground Ltd, purchased the "JMI" trademark. The pair then set about reviving the superb work of Tom Jennings and Dick Denney who earned the Vox brand name its reputation and place in history. They decided to use the name JMI because the Vox brand was owned by Korg, and unlike the Korg Vox amplifiers being manufactured at the time, the Harrisons wanted to make amplifiers that were exact reproductions of the original Jennings-Denney designs.