latter scheme that was adopted, although Jessop's plans to build the locks to take boats of 54 ft by 14.3 ft (16.5m x 4.4m) with a draught of 3.5 ft (1m) was overruled in favour of locks 72 ft by 15 ft (22m x 4.6m), which enabled the boats already plying the River Witham and Trent to use the canal. Gibson's Cut was bought for £840, but in order to entend it to join the main line at Tattershall, part of the terminal warehouse had to be demolished, as it obstructed the line of the extension. Sir Joseph expected Jessop to oversee the work, but he was too busy and suggested William Cawley from Cheshire as engineer. Cawley was engaged in April 1793, and work started immediately, but workmanship was poor. The lock at Tattershall collapsed when first filled with water, and Cawley was dismissed in October, to be followed by a series of other engineers, none of whom lasted for very long. Pressure was put on the builders of the locks at Tattershall and Tumby and the bridge at Butts Road in Coningsby, and they agreed to rebuild them, rather than lose contracts for other parts of the canal. The canal was opened from the River Witham northwards, as each section became available. Tolls of £250 were collected in 1795, but the company was experiencing financial difficulties. The decision was taken to build a wharf at Dalderby, and to terminate the canal there. All of the original capital, together with the £10,000 mortgage on tolls had been spent by early 1797, and there was no immediate prospect of continuing. The engineer John Rennie was consulted, and he suggested that a new cut from Dalderby to Horncastle would be better than trying to follow the winding course of the River Bain. Accordingly, a new act of parliament was obtained on 9 July 1800, authorising the raising of a further £20,000, but very little money was attracted to the scheme, and the company eventually borrowed £20,600 from Lord Fortescue and Sir Joseph, mortgaged against the tolls of the canal. Rennie declined to oversee the work, and so William Walker was appointed, although he was not a qualified engineer. The canal was finally opened throughout in 1802, having cost nearly four times the original estimate. The cost included £1,165 which was part of the cost for the work carried out at High