In 1986 there was a series of seven TV plays produced under the title "Unnatural Causes" by Central (ITV). The fifth episode, written by Lynda La Plante and shown 15th November 1986, was called "Hidden Talents" and starred Pat Phoenix in her final TV role recorded before her death from lung cancer on 18th September 1986.
A synopsis of the plot for this drama, as given by the BFI website, states:
Stanley (Tom Georgeson) disappeared after the mysterious death of a girl in a nearby wood. Now he returns to his home where his bedridden mother (Pat Phoenix) is tended by his older brother Harold (Tom Bell).
http://ftvdb.bfi.org.uk/sift/title/383839