Ritchie Hall became part of the school on its rebuilding in 1884 .
Ritchie Hall incorporates part of a 12th - century Canon 's Barn , while St andrew 's Lodge was built in 1713 as part of a charity school .
Ritchie Hall became part of the school on its rebuilding in 1884 but incorporates part of a 12th - century Canon 's Barn , while St andrew 's Lodge was built in 1713 as part of a charity school .