We woke up to find that visibility was reduced to just a few yards with thick mist/fog.
We only had about 3 hours cruise back to the marina to do, but we still set off at 8:30. A single hander passed us just after eight, so we knew we’d have to follow him down the locks. We helped him work through the first two, then he pulled over and let us pass.
The canal in this area has for many years been subject to land subsidence caused by the salt extraction. The land either side of the canal sinks, but the level of the canal has to stay the same. So periodically CRT ( & previously BW) have to raise the banks. This was being done on the section just north of the town.