It's a situation that will probably get worse with mixed messaging over what has to be removed from bags, and what can remain. In the past some pax have left liquids in (as per some US TSA-pre Check - note some, not all), in France cameras have to be removed, and usually laptops have to be removed (except, once more for some US TSA pre check). Get one pax who doesn't abide by the local regs, and it snarls everything up.
It will be interesting whether the relaxation of the liquids rule will ease the situation at LHR (+), but I suspect it will create problems elsewhere. A single, unified, international message is needed.