Last March there was an explosion at a semi-detached house on the Gleann Riada estate in Longford, seventy miles north-west of Dublin. The blast – which blew out the sitting-room window and left a hole in a ground floor wall – was caused by methane that had accumulated underneath the property. The two men who rented it were in the kitchen. In October, Ireland’s Health Service Executive said that Gleann Riada was ‘unsafe’ and called for ‘necessary and immediate remedial work’. Residents were told not to light fires and to keep their windows open.

