Per instructions, which again list a host of other credits:
ORIGINAL DESIGN DUNCAN KERSHAW
ORIGINAL MUSIC SONIC GRAFFITI
Z80 CODE D.C.P. Z80
GRAPHICS JABBA SEVERN
AY PLAYER & CONVERSION ANDY SEVERN LOADING SCREENS JAMES KING
STORY DUNCAN KERSHAW
OTHER TEXTUAL & SHOTS SIMON DANIELS
ARTWORK & LOGO JON CLARK
INLAY PRODUCTION MIKE,PETE,SIMON,SI,JOHN, STEVE T & STEVE D
MASTERING KEVIN PARKER
MAIL ORDER BELINDA & SUNGLASSES McCANN
PRODUCTION SIMON 'MOONCHILD' DANIELS