This is how Wayne Tyas plays it if you watch The Exploited play Horror Epics in San Francisco in 1985.
[Intro]
G|-------------------------------------------------|
D|-------------------------------------------------|
A|-------------------------------------------------|
E|-15-15-15-13-15-15-15-13-15-15-15-13-16-16-16-18-|
[Verse]
G|---------------------------------|
D|---------------------------------|
A|---------------------------------|
E|-3-3-3-1-3-3-3-1-3-3-3-1-4-4-4-6-|
This is how I've seen it played. Also I'm not fully sure about the show/venue but I knew some about it.
People who played in video
Drummer-Wullie Buchan
Bassist-Wayne Tyas
Singer-Wattie Buchan
Guitarist-Karl Morris
they also of course all worked on Horror Epics (album)