This intense, touching, 2-scene, 2-actor, 1-room play was originally written for a South African setting, but it is easy to envisage the poverty-stricken, industrialised (steel/trains/coal), isolated community being relocated in Wales, with the Afrikaaner speech switched to Welsh (my conjecture). 

Unable to endure the guilt of his industrially-crippled father's death,  Johnnie, an emotionally-crippled, quietly insane, clinically depressed adult orphan encloses himself years in the 2-room apartment that they shared. He fends off his madness by obsessive thought and action, finding constant rhythms and patterns in speech, writing, and numbers. 
   When his estranged sister Hester (a prostitute) returns after 12 long years, hoping to stake an early claim on a hefty insurance that she believes that her father received, Johnnie begins a comforting charade of having a still-living father that he must care for. 
    In the process of confronting their family demons, Hester resigns herself to the loneliness of low-grade prositution, while Johnnie finds a strange new sense of a 'self' that he can become: by taking up his father's crutches and tall tales, he finds a role which will at last enable him to interact with people on the 'outside'; as a cripple, he has a 'story' to tell, and a tailored personality.

Of the 2 parts, Johnnie's is the largest and most intensive. 
Johnnie's rhythmic, sing-song lines are largely made up of homilies, catchphrases, soundbites and advertisement taglines. You can clearly hear Vibert's delivery on reading the lines.
 

n. Coincidentally, Vibert's character in Antarctica also ends up having his mind jump from one subject to another, grasping at mental straws to focus on, reeling off huge cross-referenced monologues 

Quotes:
"Am I going mad? No. This is not madness. Those who are, don't know they're mad. Wheras I know...I'm mad...something wrong there. If you think you're mad, you're not. That's it! Only when you think you aren't!"

The end of the day, any moment, everybody rushing away from it, leaving it, for me, just me, there in the shadows and no questions asked, for once enough, ME is enough, need nothing, whisper my name without shame...until the lights go on".

"I missed the end...he died in my sleep"

"Wilson's Beef and Iron...double dose. Clams the nerves and eases the pain. With water after every meal"

n2. Thanks to Liana for the dates

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