That's the fellah. One of their songs definitely implies he was involved with a very right wing organisation at one point and the BNP is mentioned by name. I don't think the wiki for him looks very definitive but this is going back like 15 years or something and there's not a lot of info on them on the net that dates back to that period.
Ah, I believe the song is called 'No Comply'. I won't post the lyrics here as they are a bit NSFW in places but there is something in there. They weren't a bad band actually, even if they did come across as the militant wing of The Levellers. Just the job on a blazing hot Saturday afternoon at your festival.
He's the lead singer in a band. That's pretty much part of the job description isn't it?
Jon