As a ground trainer that resides at LHR but travels around the patch I do have one observetion to make that effects all CC. Here at BA it is forbidden to have any Cabin doors open without the jetty or steps being in place. I observe time and again the situation with doors open with nothing in place only the tape. This will not stop you falling out and seriously injuring yourself and has been fatal. If this practice exists in your airline stop doing it and get your procedures changed.