Just found this on the channel four website:

Straight Edgers
Straight Edgers are a subculture of people who don't drink, don't smoke, don't take drugs or have casual sex and are usually vegan. Their beliefs and passion for the subculture are born out of the music, which is called 'Hardcore' and is a derivitive of Punk. Some Straightedgers will be discussing their beliefs in the studio.

This is on Richard and Judy tonight - channel four, 5 o clock.