Portsoy was a fishing village in northeast Scotland located about 40 miles from Inverurie.
A group of Armidians were based in a derelict house protected by a perception barrier after being awakened from stasis. The Armidians also hid a stolen RAF jet fighter they had been inspecting inside a fishing shed, which was also behind a perception barrier. (AUDIO: Vengeance of the Stones)
Location information
Though it's possible that a real world location doesn't exist in the same geographic space in the Doctor Who universe, such cases are few and far between. Thus, the map to the right is probably a good indicator of the DWU location of Portsoy.