William Sandys in 1496, who became the Lord Chamberlain to Henry VIII in 1523. Much of the park became part of the estate at around that time. John Chute inherited the estate in 1754, and was probably responsible for enlarging the lake. When the owner Charles Chaloner died in 1956, the estate, which consists of of gardens, of parkland and of woodland, was given to the National Trust. At its southern end, the lake is crossed by a three-arched bridge, constructed from red bricks with cast iron parapets in 1840. At the bottom end of the lake is a weir with a small lake beyond, and the Vyne Stream heads northwards, passing under Morgaston Road, to reach the mill pond at Beaurepaire Mill. Milling Bow Brook and its tributaries have been used to provide power for milling since at least the time of the Domesday Book in 1086. The Manor of Sherborne St John was owned by Hugh de Port at that time, and contained three mills worth 27 shillings and sixpence (£1.37). One of them, probably that located where Beaurepaire Mill stands, was given to Bartholomew Pecche by William de St. John, and was subsequently given to Monk Sherborne Priory by Henry de Port, when he founded it in 1130. The priory received a mark of silver each year from the mill, as well as having all of their corn ground at no charge, but de Port's grandson Adam obtained the mill again, by exchanging it for all the tithes from his mills in Sherborne. In 1302, two mills and a fishpond were mentioned in Sherborne St John, one of which was at the site of the present mill building, next to the Mill Head fishpond, while the second was probably on the Wey Brook to the north of the village, where there is evidence of a mill pool. The Beaurepaire Mill appears on an estate plan dating from 1613 in its present location. Both Beaurepaire Mill, now a Grade II listed building, and Sherborne St John Mill were marked as corn mills in 1872-73 and again in 1911, though the former was converted to domestic accommodation in the 1870s. Water quality The Environment Agency measure water quality of the river systems in England. Each is given an overall ecological status, which may be one of five levels: high, good, moderate, poor and bad. There are several components that