We tried to book, but were told that we couldn’t because Bartimaeus’ draught was too great – 0.71m versus a maximum of 0.69m. After the initial disappointment, I checked the Statement of Conformity which forms part of the documentation for the boat. It shows the draught as 0.66m, so a phantom 5cm of additional depth has crept in to the documentation somehow. I also spotted that the recorded length of the boat on the Canal and River Trust system was a metricated version of 58 feet. But Bartimaeus is 58′ 6″.