following meetings of landowners held in 1752 and 1753, they asked john grundy jr, as his father had died in 1748, to re-evaluate his plans from 1744 and consider a plan for a "grand sluice" that had been produced by daniel coppin in 1745. grundy suggested that the 1744 cut should be extended by a further into boston, and that the sluice could then be built on the extension. the landowners moved the location of the sluice nearer to boston, but otherwise approved his report, although no action was taken. john grundy was again consulted in 1757, and langley edwards of king's lynn was asked to review the positioning of the sluice in 1760. the landowners then asked john smeaton to liaise with grundy and edwards, and the three engineers produced a joint report in 1761, with estimates of £38,000 for drainage works and £7,400 for improvements to navigation. the report was approved, although a meeting held in january 1762 decided that the new cut should revert to the alignment suggested by grundy in 1753. the location of the grand sluice would be as suggested by edwards in 1760. grundy produced another engraved map, and parliamentary approval for the works were obtained in june 1762.