An anti-flooding reservoir could be built close to a prehistoric henge in Lincolnshire. Environment Agency officers are to begin looking for sites to build new flood defences in a bid to protect Horncastle. Next month they will begin assessing land close to the River Bain in a pro-active effort to prevent the flooding which has blighted the town in recent years. Town representatives have already been told that the essential facility could have to go just north of the town, in an area known to have been occupied in the Neolithic and Early Bronze Age - from 4,500BC to 1,200BC.