of the nave, with its arcades and clerestory, is gone, but the outer walls, much patched, show on the south (cloister) side how the large arched windows of the south aisle, broadly spaced, rose up from the string course marking the roofline of the cloister walk. The cloister wall on the east side shows the openings of the sacristy, the chapter house and (possibly) the infirmary, but the dormitory which ran above it and the body of the main structure is gone. This range extended further away to the south, towards the reredorter, two walls of which are standing. The full extent of the cloister south range is occupied by the walls of the Refectory, a high hall lit principally by a very tall west window, its arch still dominating that corner of the site. Standing walls from the ground storey of the western range, which probably included the cellarer's quarters, complete the enclosure of the cloister, rising towards the western end of the church nave. The main external entrance to the cloister ran through this building, and in around 1500 a tall brick gatehouse with two octagonal turrets was added, one side of which still remains. At the north-western corner of the complex, a former farmhouse with a brick regency front represents the western limit of the church nave, an early timber house stands longways behind it occupying the former south aisle of the church, and a tall more recent building stands within the cloister yard itself. The Guest hall is not shown by Suckling, but partially survives in buildings standing apart at the north-west corner of the site. Archaeological investigations The Lady chapel was preserved by use as a roofed farm building during the 18th century, and was re-thatched as a place of worship during the 20th century. Excavations during the 1980s established the position of the lost south wall and turret of the brick entrance-gate structure, and explored the interior of the reredorter building. In a separate investigation, the interior of the presumed abbey Guest Hall was excavated. Two long upstanding medieval walls had survived: they are incorporated into a new structure for the use of Pro Corda. In 2013 Leiston Abbey was the first crowdfunding campaign to run on the DigVentures DigStarter platform. In 2015 the project entered the third year of five proposed digging seasons under a licence granted by English Heritage. Its aim was