The Fire Safety Order 2005 requires property managers to comply with current fire standards for corridors, stairways, entrance lobbies etc.
Multiple layers of incompatible paints
“Multi-Layer” can create dangerous Class 4 or EN Class D + E Surface Spread of Flame risk.
British Class O is superseded by the safer standard BS EN Class B s1 dO.
Many Flame Retardant Paint Systems have contained the heavy metal Antimony and create poisonous, antimony gasses, increasing risk in a fire.
Consider Thermoguard WALLCOAT system