Mystery seems to have been solved. Elderly relative has written to me and thinks two events have been merged in my husband's memory. Appears his father was injured during the war (when my husband was a toddler)by a boiler explosion, and an incident at Cammel Lairds some years later when there was a minor gas explosion in which he was hurt.
It is funny how our memory can merge 2 separate incidents into one when trying to recall something so far back
The joys of getting older eh
Did find any info on your Grandads and Dads incidents MK?