<p>A shelving system (10) with height adjustable shelves is described, with reference to a portable trolley with shelves for holding medical equipment, although it is also applicable to portable and stationery shelving systems for many uses. The shelving system (10) comprises at least one shelf (18) defining an edge face (22). At least one opening (50) is formed in the edge face and includes one or more projections (52). The system (10) further comprises at least one accessory (58) for fitting into the opening (50) and having a complementary shape in order to mate with the at least one projection (52) in the opening (50).</p>
