There's really only two:
Boy - Jeremy Flynn.
Don't know much about the actor. There's a Jeremy Flynn who did a bunch of films around the right time.
• Schindler's List (1993) Brinnlitz Man
• Afraid of the Dark (1992) Jim Gilbert
• Comrades (1989) Brine
• Flooding Actor
I'll see if I can find a photo.
Yuka - Toyah Willcox
Famous english ex-punk musician, actress and TV presenter. See her official web site. One of my aims is to try and get her recollections of making Headcrash.