Sorry, can't answer your question for what remains now, but I have a book simply called "BMW 3 Series" by Jeremy Walton which gives the following UK figures for the E30 M3 from 1987 to 1990;
M3 - 211
M3 Cabrio - 32 (1989 - 1990)
M3 Evo - 38 (all 1990)
The book claims the figures are the official approved import figures via BMW (GB), and that for the M3 expect the total figure to be double when taking into account unofficial / personal imports.