We are indebted to David Lee from the Facebook site Cardiff Music History for supplying me with this original poster for the gig and these extra photos from the night.
Thanks to David we can now confirm the gig took place Wednesday 30th Sept 1981 at Cardiff Top Rank.
These are most of the Predatur contact sheet pics we have from Geoff Swain from that night plus extra pics that David provided me with of Persian Risk.
If you look carefully you can see the Predatur back line at the back of the stage.
Thanks David!