These secondary screenings are really absurd. My last trip was SYD-DXB-LHR-HEL and though I was in sterile areas in every airport once I checked onto my SYD-DXB flight, yet I had two additional security screenings (at DXB and LHR). Not only does this require discarding any large bottles of water given to me on the planes, but at LHR I was made to open all my sealed amenity kits given to me by QF on their flight segments and consolidate any liquids/gels into my 1 "sealed" baggie! I find LHR to have the most anal security screening in the world...yes, I know, it's for my own "protection", but to have to dump items actually given inflight by an airline is the height of absurdity. (Not to mention, there is still not international consistency to prohibited items since NAmerica and the EU began to permit small scissors but the rest of the world still does not permit these in carry-on!)