This booklet describes all of the stained glass windows in the church, together with notes and illustrations of other features. The chief artwork of the church is its west window by Wilhelmina Geddes, one of the great stained glass artists of the twentieth century. It is her last monumental work and one of the finest stained glass windows in Wales. St Peter's is a Victorian building designed by R.J. Withers. Earlier stained glass of the 1870s includes work by Daniel Bell and Lavers & Barraud. Not all of the windows have been firmly attributed, but twentieth century works by Robert Newbery, C.E. Kempe & Co., Shrigley & Hunt, Ninian Comper and Powell & Sons are all found at the church.