Got on the dlr today. Was busy. As I got on there was a woman in front of me and two seats at the front free. One was the actual front seat, next to a young boy and the other woman went for that.
The other free seat was in the row behind next to a man. I sat next to him. As the other woman sat down infront of him the bloke tapped her and said that his wife was sitting there.
Woman (who was wresting a large suitcase) said sorry and then any other free seats further back had gone so she had to stand for the 30 min journey. I turned round wondering where this blokes wife was and she was just getting on! I doubt she had any medical need to sit down as she'd done some running race earlier and had a medal round her neck. The boy was her DS and was only 3 or 4yo so could have sat on her knee.
I genuinely think Id have politely refused to move.