Fire Brigades Union general secretary Matt Wrack said:
"Firefighters at the Apollo Theatre were fantastic in their response to an incident that could have seen significant loss of life, but we're sick of being praised by politicians one minute and stabbed in the back the next.
"Our world-class fire and rescue service is being devastated by the worst cuts in our history, cuts that prevent firefighters from doing their jobs during day-to-day emergencies, major incidents like the Apollo Theatre or Clutha Bar collapses and recent floods and storms."
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The pair have been poring over old maps and records in their bid to convince the council the warehouse should not be converted into flats.