Not Mk1.....but some scans of the Cooper Press Release, price lists and brochures, etc I have from 1999 which may be of interest.
"Mini Cooper S Works - 1999 (March) Colour: Brooklands Green & roof in Old English White. Decals/badges: Coachlines with "S works" decals. Special red-winged badges front and back. Interior: Alloy dashboard, door cappings, door furniture, and foot pedals; leather steering wheel and gear knob. Equipment: CD player, 12-inch alloy wheels. Production: 250. Options: Jack Knight 5-speed gearbox and Sportspack. With 90 hp output from its big-valve high-compression engine, the S Works is said to be the most powerful Cooper ever made."