Anyone who knows me well will know I am often trying to optimise things. While working a lock flight, I generally try to maximise the speed of the boat. Sometimes this will see me running back and forth between locks so that water is moving in one while we wait for equilibrium in another. Today we met a woman who was clearly maximising something else. After her husband drove her boat out of the lock, she stayed to chat to Clare while I drove in. She then shut a gate for us (I usually did that), finished her chat and sauntered on – maximum relaxation!