The source for Penson’s terracotta appears to have been the brickworks associated with the Oswestry coalfield between Trefonen and Morda which were to come into the ownership of the railway engineer Thomas Savin. Terracotta was being promoted as cheaper alternative to costly carved stonework for decorative work on churches. The terracotta was produced by casting, which was then fired. Similar designs on the columns and arches can be seen on the porch of the Llangedwyn church and Llanymynech, and these are presumably designs prepared by Penson.