The inside of Worcester Cathedral is Dark. If you use a flash, you get disapproving looks, even if you are flashing your yellow camera permit, and anyway, the light from the flash looks bright enough if you are looking at it but most of the light gets lost in the nooks and crannies of the cathedral superstructure, or finds a more interesting world on the other side of the walls, or finds the prospect of retracing its steps back to the camera so unappealing, that it would rather rush too its doom amongst the grains of some sandstone brick. The only solution is to use a tripod and be a "professional" photographer.