Matrician Bench of Ordnance Surveyists

The Matrician Bench of Ordnance Surveyists was an organisation on Gallifrey. They monitored the positions of various Time Lord Houses. K9 reported to Leela that according to this body, the House of Lungbarrow no longer stood on the side of Mount Lung in the Southern Mountains and it had vanished without a trace. (NA: Lungbarrow)