 Houses in the area of Knotty Green are often some of the most expensive in the country with houses often exceeding 6,000 sq ft, and £3 million in value.The centre of the old hamlet is still identifiable at the junction of Penn Road and Forty Green Road where there remains a remnant of the old green from which the hamlet took part of its name.The name of the hamlet can be traced back to the 13th century.