Sat 9 Sep 17 British Trust For Ornithology, The Nunnery, Thetford IP24 2PU Heritage Open Day: Come inside for a guided tour of the BTO buildings. Discover the hidden architecture and its Benedictine history dating back to 12th Century when it was known as the Nunnery of St George. Plus, take time to enjoy the great outdoors with a bug hunt in the Nunnery grounds... READ MORE>