Common Lock. Common as in grass land or as in 'many of ' or some other reason?

Original taken on a Konica Minolta A200

Photograph taken by Richard Mathews on 3 April 2008 and was added to the database on Monday the 7th of April, 2008

This photo is of Common Lock No 14 on the Trent and Mersey Canal (Main Line - Burton to Fradley)