An interesting point about the call bell, I used it last Tuesday night for the first time in - I cannot remember how long - certainly more than five years. Normally, I would catch CC attention as they are passing.
As it happens, I was on my frequent route of JNB~LHR (BA WT+ this time) and the dinner choice was the classic beef/chicken. I asked if the beef had any spices in it and was told that it did not. My neighbour opened his beef and it certainly smelt fine. I took the beef. It turned out to be liberally covered with black pepper and so I used the call bell to ask for the chicken!