Once we’d cleared the top lock at Camden, the canal is level for nearly twenty miles. We opted to extend the level still further by turning in to the Slough Arm, a 5 mile cul-de-sac. Within the first few hundred yards we had seen a pair of kingfishers chasing each other. We tried to point them out to a pair of fishermen on the bank, but they seemed underwhelmed, perhaps they viewed them as competition. They had much more competition from a cormorant we had seen earlier. It had caught a fish that looked longer than its neck, but with a swift movement the whole fish vanished in to its beak.