**1. The 3 immediate steps** 1. Switch off power to that room at the panel (if the panel is dry). 2. Ask the neighbour above to close their water valve. 3. Put a bucket under the drip. **2. What NOT to do** - Do not switch the lights on or off in that room: water can reach wiring and fixtures. - Do not touch fixtures or sockets near the leak while the floor is wet. - Do not poke a bulging ceiling unless a bucket is under it. - Do not assume closing your own main valve fixes it: the water often comes from the flat above. **3. Who to call, in what order** 1. The neighbour above: ask them to close their valve. 2. The building manager or landlord: say where the water appears and since when. 3. A plumber, if the source may be your own pipes. 4. Your insurer: report it within the policy deadline. If anyone gets a shock or you see sparks, call your local emergency number. **4. What to check afterwards** - Photograph the damage with dates before cleaning and list damaged items. - Do not restore power to that room until an electrician has checked it. - Watch for damp, bubbling paint or a musty smell over the next 24 to 72 hours.