Found it (I think ... at work so can't listen)! It was probably Alton Irie:
Gemini v Killamanjaro Skateland, Half Way Tree Road, January 1984http://www.whocorkthedance.com/geminispecial.html
Decided to do a search on Cocaine on the page and found mentioning of it in these two also:http://www.whocorkthedance.com/virgospecial.html
-- Session Twenty Nine: -- Virgo Hi Fi @ Redside Theatre, Yallahs, St Thomas 26-12-81http://www.whocorkthedance.com/TributeT ... quall.html
-- Session 22 - Aces International - Top Hill, Westmoreland 1983
Good luck with you project!