According to this it's 1988:
(Also on the official Pete York site: http://peteyork.net/ -> biog, page 6)
I already judged by Nicko's haircut that it wasn't 1987. I thought it was 1989 because I assumed he'd be too busy with Maiden in 1988.
Nicko playing War Pigs (unsteady camera work but still great to see and hear):
Here he's doing Voodoo Child plus a solo. You'll love his reaction when he's interrupted by some loud car.