Construction of the St. Magnus Cathedral began in 1137 in Kirkwall, in the Orkney Islands off the northern coast of Scotland. St. Magnus is Britain's most northerly cathedral. The nave, pulpit and east window are featured on the 81p stamp from Great Britain. The Willis organ was installed in 1926 as part of the cathedral's rebuilding. The church's site and the Willis site state that the organ is behind a "decorative screen." This may explain why one really cannot see any of the organ in the present stamp. Henry Willis' website has a nice page devoted to the organ, including photos of the installation, of some of the recent restoration work, and the stop list.