Another site mentioned in the Machynlleth Borough Guide which we can no longer see is the English Christ Church. It was built in 1881, but closed for worship on 3 October 1865 and was demolished in August 1867. The site is now occupied by the town’s library. The foundation stone of the church has been retained and has been set up in the entrance. It was unveiled by the Bishop of Bangor in March 1990. It reads: ‘Under this spot was laid by Mary Cornelia, Marchioness of Londonderry, on the 1st day of June AD 1881. This is none other than the house of God.’ The tombstones of Mary Cornelia, Marchioness of Londonderry and other members of Y Plas family, can be seen in the churchyard of St Peter’s.