 An archaeological study was carried out in 1998 on the instructions of the Vale of Glamorgan Council to establish their age as part of a survey to assess their current condition, and it was estimated that the major portion of the south and west walls was medieval in date.Volunteer work to remove vegetation from the walls led to further excavations being carried out in 2007 and 2010, and it was discovered that much of the wall above ground level had been rebuilt in the 18th century on the medieval foundations.A small section of the west wall collapsed during 2008/2009, leading to repairs being carried out on the masonry, using the original stone where possible but complying with modern building standards.