‘The other member of the circle who claimed to have seen the face was Mr. A. P. Underwood, of Westholm, Letchworth, who is gathering material for a book he intends writing on haunted houses.’
The Woburn Reporter
October 14th, 1947
Underwood’s first name was actually Alan, but he went by his middle name, Peter.
As well as his recollection in No Common Task, Underwood first publishes a full account of this investigation in A Host of Hauntings (1973), having included the historical backstory in the Gazetteer of British Ghosts (1971).