Archaeological recording of the lock by C Currie of CKCA for the National Trust, undertaken during repair works. Two phases of brickwork were recorded. Both sides were made of frogless bricks, suggesting a construction date before 1900 as most likely, with the phases distinguished by different mortar types. Documentary research has revealed that major repairs in concrete were carried out to the lock chamber in 1937, giving it the appearance it had prior to the present works.