Merv play bass in Skrewdriver for many gigs and for albums: 'White Rider' (1987), 'After The Fire' (1988), 'Warlord' (1989). Before this, he play the drums for Catch 22 (not the UK band with same name and song in V/A 'On The Streets') and sings for another one called National Outrage.
Catch 22
National Outrage