Turned out we were not on the official Barnton cut mooring after all. That was a few hundred yards further on round the corner, with bollards (and more boats).
Trailed behind another narrowboat after the first lock (Saltersford). It was frustrating because he was going so slow that I couldn't get the engine up above 700 rpm, yet it didn't seem polite to overtake. In the end I stopped for while, so that when we did get going, I could allow the engine to run freely and charge the batteries properly. We caught him up at Dutton locks with hardly any delay.
Noted that there are visitor moorings at both Acton bridge and Dutton lock – useful to remember.
6.5 miles, 2 locks, 4 hours engine