BRIDOL is the British Sundial Society's Register of Fixed and Mass Dials, which gives detail and photographs of about 8000 fixed sundials and 3000 mass dials in the UK.
Some of these are in private gardens, but the majority are publicly available.
In addition to the multiple dial llustrated, there are several diptych dials on the walls of the house. More information requested.
McGibbon & Ross, Castellated & Domestic Architecture of Scotland, 1889-92, Vol 5, pp374-6. A R Somerville, The Ancient Sundials of Scotland, Rogers Turner Books, 1990.
