BLOC began life in 1975 as the Brussels Gilbert and Sullivan Society under the chairmanship of Peter Barker-Jones. During the next seventeen years, all the Savoy operas were performed on at least one occasion, either in concert or as a full production. However, the mounting costs of full scale operatic productions and the continuing dependence on ticket revenue as the primary source of income meant that the Society had to broaden its range of music theatre to attract larger audiences. For this reason, the Society was re-launched in 1992 as the Brussels Light Opera Company, or BLOC as it is commonly known.

Since the club’s name change in the 1990s there have been fewer G&S productions as BLOC has explored other musical theatre (Fiddler on the Roof, Evita, Beauty & The Beast, Pajama Game, Guys & Dolls, My Fair Lady, Sweeney Todd, Wizard of Oz, A Christmas Carol, Crazy for You - to name just a few).