[1] The church was undamaged during the Reformation, the dual altars being spared by the order of Edward VI in 1550.

[2] The church similarly escaped any large-scale Victorian reconstruction and was carefully restored by W. D. Caröe in 1908–1909.

In the Powys volume of The Buildings of Wales series, the architectural historians Richard Scourfield and Robert Haslam record a description of it as, "the most perfect and elegant now standing in the kingdom".

They comprise four groups: a Stuart Coat of Arms[2] which the Royal Commission on the Ancient and Historical Monuments of Wales considers are those of James I; two groups of Biblical texts, including the Lord's Prayer, the Decalogue and the Apostles' Creed; and a "Doom Figure"[2] of Death as a skeleton with an hourglass and spade in his left hand and a scythe in his right, which dates from the 17th or 18th century.

[3] A number of structures in the vicinity of the church have their own Grade II listings including St Issui's Well,[6] the churchyard cross,[7] the former stable,[8] and the lych gate.