Yes, French's may be your best bet as the Methuen ed is out of print. There is this recent edition which may be different (cut 'n' pasted from Amazon UK):
Close the Coalhouse Door Alan Plater Our Price: £7.95 Availability: Usually dispatched within 2-3 days Hardcover - 104 pages new edition (29 June, 2000) Bloodaxe Books; ISBN: 1852244895
RtS