Petrol in balloons thats a new one on me. Also I do not think there was mains gas in Strabane - Tyrone late 70s.The story I heard about cinders was as follows.
Improvised incendiary comprising of balloons full of petrol hung over the ring of an electric cooker, ring turned on, depart with a nonchalant whistle and cheery gait, several minutes later satisfying whoosh as the petrol ignites
Cinders version, hang balloons over a gas ring, turn on gas ring, depart covered in flames.
I believe that to be true.