in 1806, the company agreed with the aire and calder canal to replace the lock at fall ings with a new cut (fall ings cut) and a pair of locks, the work to be jointly funded. legal challenges from millers resulted in some delay, but the cut was opened in 1812. by 1823, as a result of pressure from carriers, boats were allowed to use the navigation at any time during the week, but the company refrained from authorising use on sundays as they could not ""consent to so great a deviation from established custom"."