Nottinghamshire Fire and Rescue Service has shared photos from within County Hall showing offices destroyed by flames and the Conservative Group's corridor badly damaged by smoke.

And the emergency service has issued a warning to businesses, stating the photos show how important fire doors were to preventing further damage.

Nottinghamshire County Council's West Bridgford headquarters caught fire last Thursday (July 28) when an electrical fault in the ceiling void sparked and set alight.

The flames led to the first-floor office of Councillor Neil Clarke (Con), portfolio holder for transport and environment, being "pretty much burnt out", with the leading politician losing personal items, files and computers.

More than 20 hours of fire investigations deemed the cause of the blaze as accidental, although the fire service has said the incident could have been "much worse" had it not been for fire doors installed in the building.

The fire service says automatic, self-closing fire doors shut when alarms sounded, meaning damage to the building was significantly reduced.

The automatic fire doors that closed when the alarm was sounded. Photo Credit: NFRS.

The blaze did, however, spread to the second, third and fourth floors, with County Hall impacted by fire, smoke and water damage.

A fire service spokesperson said: "[These] photos from County Hall fire show the importance of fire doors.

"The fire was contained to one corridor by self-closing fire doors which shut when alarms sounded.

"Damage to the building could have been much worse if these weren't in place."

Watch Manager Tim Marston added: "The fact that the affected floor had well-fitting automatic fire doors, that functioned correctly, is a testimony as to why the most severe fire and radiated heat damage was contained to one area, leaving adjacent stairwells clear to aid evacuation.

"I urge all building owners, where fire doors are fitted, to ensure they check the effectiveness of any automatic or self-closing devices, that doors fit correctly within the doorframe and escape routes are always kept clear."

County Hall was handed back to the council on Monday (August 1), with a clean-up operation underway.

Council staff continue to be asked to either work from home or from alternative buildings while this work takes place.

And the ruling Conservative group is expected to face disruption, with councillors to be rehoused into alternative accommodation until repair work concludes.

Cllr Ben Bradley MP (Con), leader of the council, added: "In case anyone was in any doubt about the fire at County Hall this week, [these pictures show] the view from my now obviously uninhabited office.

"The fire service has confirmed the fire was caused by an electrical fault. Thankfully, nobody was in the room at the time.

"I'm very grateful to staff and emergency services who ensured everyone left the building safely and things were brought back under control quickly.

"I don't think we're getting back on this corridor any time soon."