However, the lands around Whenby were forfeited to the crown in 1715 after James Radclyffe, 3rd Earl of Derwentwater was found guilty of treason.The surface is undulating, and the soil generally a rich clay loam, and the parish is an average of 200 feet (61 m) above sea level.[11] St Martins has a chancel, north aisle, porch, nave, mortuary chapel, and a tower, containing three bells.[12] There is a doorway of ancient date, which is generally supposed to have been used for public access to the church, or in connection with the priest's house.[13] Although declared redundant in October 1983, it still forms part of the ecclesiastical parish of Dalby with Whenby,[11][14] and is maintained by the Churches Conservation Trust.