Managing School Facilities Guide 6 'Fire Safety' tells schools: not to put displays down stairways on escape routes; to keep displays away from curtains, doors, exits, ceiling voids without fire barriers and heat-sourcees; and to try to keep displays in one area. Their hazard check-list also says that they can be sprayed with a fire retardant.
Former Building Bulletin 7 (of lamented departure) stated that no pin board may be fixed in a dead-end corridor.
Various Education Authorities have issued guidance on displays in the past even giving dimensions and distances from doorways, socket-outlets, light switches, etc.
School fire risk assessments should be taking all this into account - but in my experience schools (particularly at primary level) seem to be full of display material which, presumably, contributes to rapid fire spread in the numerous incidents of arson these days.