The triggering and evolution of internal transport barriers (ITBs) in optimised shear (OS) plasmas in JET is linked to the q profile [1], [2]. Moreover, the duration and performance of ITBs are often limited by MHD activity related to the q profile [2], [3]. Hence it is of primary importance to learn how to control the q profile, both before the high power phase, to prepare the target plasma, and during, to maintain the ITB. The high current drive efficiency of the lower hybrid wave makes it an obvious candidate for this purpose. Lower hybrid current drive and heating (LHCD) is used routinely to get reversed q profiles in OS plasmas in JET. Recent experiments indicate that LHCD can control the q profile also during the high power phase.