I'd say to the person behind me "Mind my space for me" and then follow her the whole way down the queue to make sure she ended up at the very backBig long queue outside Tesco on saturday morning. Woman in her 50s just parked herself in the generous distance I'd left in front of me. I just said "I don't think so". She immediately started with the million-words-a minute in a 'don't-get-aggressive' tone and presumably moved down the queue to jump in somewhere else. There no way she was joining the end, I was in the first 10th of the queue.