The Spectre of Lanyon Moor

The Spectre of Lanyon Moor is a Big Finish Productions audio drama based on the long-running British science fiction television series "Doctor Who".
Plot.
The Sixth Doctor and Evelyn team up with the Brigadier to defeat an ancient evil in Cornwall.
References.
Several characters are mentioned by Emilia Rumford in Part Two of the televised story The Stones of Blood. Lexington-Smith is referenced and it may be assumed that Idwal Morgan, Professor of Megalithic Archaeology, is the character in this audio play.
Lanyon Moor also turns up in the opening moments of the first Tomorrow People audio.