 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.The only major structural change was that Christian restored the Chancel to its 13th century form by removing the low pitched roof that was part of the 15th century refurbishment.