The Romans built Caistor town in troubled times – and now Caistor Roman town could be the last bastion for rare lichens and chalk-loving plants that have grown undisturbed for hundreds of year on the ancient Roman walls.
http://nds.coi.gov.uk/Detail.aspx?NewsAreaId=2&ReleaseID=404300&SubjectId=2
seen at 12:59, 2 July in Commonwealth War Graves Commission News - national.