Turn off your metered gas supply, turn the valve handle to horizontal (level with the ground). You may need a spanner to do this.
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Ventilate the area by opening doors and windows.
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Leave electrical appliances as they are - don't turn them off or on.
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Vacate the premises and call Frank Energy on 0800 086 400.
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If possible, call us from a neighbouring property as yours may be unsafe.