 The north and south transepts were added, the Chancel lengthened and, a few years later, the south porch built.Finally between about 1450 and 1500, the nave was heightened with a clerestory (a row of flat-headed windows) inserted, the transepts and Chancel were re-roofed and a fourth storey with battlements an gargoyles added to the tower.The 19th century, largely sympathetic, restoration (Chancel, 1857-8, rest of church, 1872-5) by Ewan Christian faithfully preserves St Laurence's medieval appearance.