Stop the water first. Nothing else matters until the source is isolated, whether that is the mains stop tap, a fixture isolation valve or the hot water unit's isolation point.
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For a burst pipe or a serious leak, turn the water off at the mains tap before you call. If water is anywhere near power points, the switchboard or light fittings, stay clear and treat it as an electrical hazard. Do not enter standing water in a room with live power.
