The project was successful and has created an unusual landmark that has become a fascinating destination for anyone interested in the more curious aspects of the British countryside. When the reservoir is full St. Matthews appears to float serenely on the surface of the lake and when the water is lower it confuses the eye as it becomes clear that half of the church appears to have sunk into the ground. Exactly when the first Christian church was built on the site is uncertain although it was probably around 1250 AD. Over the generations it served as a parish church until the early 1700's when much of the village was demolished to create an estate for the wealthy Heathcote Baronets. The now isolated church was retained and became both a family chapel and mausoleum.

It was renovated in 1764 with the replacement of the nave and the chancel. A 14th century tower remained in place until it was replaced in 1826 with a new one in the Corinthian style designed by well respected architects Thomas Cundy and son. The tower is a replica of those at St. John's concert hall, Smith Square, London. A portico in the Ionic order was also added at this time to create a dramatic alcove. This significantly improved the quality and magnificence of the church. Certain sources claim that the Nave and Apse were later rebuilt in 1911 by J. B. Gridley of London. In 1920 the Heathcote family relocated to their properties in the north of England and the Palladian mansion was demolished. The estate was divided leaving St. Matthews as a lonely and largely forgotten mausoleum. It remained as such until the need to flood the valley prompted local volunteers to relocate the burial remains and reinforce the structure against the rising waters. According to various sources only the tower and the clerestory can now be seen.