COMICS REVUE has been reprinting Modesty Blaise since issue No. 26, starting with panel No. 6625, following through right to the end of the strip (panel 10183) in issue 187 (except issues 30, 37-39 and 43). From Comics Revue 188 onward Rick Norwood has been reprinting the strips from the very beginning in chronological order. Maybe he will someday accomplish what many publishers have promised to do but never fulfilled - The Complete Modesty Blaise Collection. Hes already well beyond halfway point ...
Besides Comics Revue Rick Norwood reprinted older strips in Modesty Blaise Quarterly, Comics Revue Annual #2 and Comics Revue Special #1.
Recently he has also published two trade paperbacks with collections of three stories each, Live Bait and Lady in the Dark.
You can order directly from Rick Norwood (also some back issues of Comics Revue).