Check for electrical proximity
From a safe position, note nearby lights, sockets or appliances. Do not operate wet fittings.
The visible patch may be below the source. Start with safety around electrics and the ceiling itself, then record the rooms and plumbing fixtures above.
Do not touch wet electrical fittings or stand beneath damaged plaster. Contact the emergency services if there is an immediate threat to life or fire risk.
From a safe position, note nearby lights, sockets or appliances. Do not operate wet fittings.
Record a nearby bathroom, toilet, radiator or visible pipe. Do not assume it is the source.
Take a wider room view and a closer image without standing below a damaged area.
See Leak Repair for a likely plumbing leak. Read urgent plumbing guidance where water is active, spreading or creating a safety concern.
The room, nearby fixtures and current water movement are more useful than guessing what is hidden in the ceiling.
A clear message helps a plumbing professional understand the next step.