Here's what you should do if you smell gas:
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Avoid flames and sparks - don't light matches or cigarettes. Don't use electrical switches, appliances or mobile phones. Never light a gas appliance if you detect gas odour.
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Turn off all gas appliances, making sure the pilot light [a small flame that lights the main burner] has gone out.
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Open all windows and doors to disperse the gas and ventilate confined spaces, This is important because unlike natural gas, which is lighter than air.
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If you still smell gas or you think gas is escaping even after all appliances have been turned off, you should switch off the main gas supply tap and immediately call the Emergency Line on 19990.