If you smell gas or think there might be a gas leak:
Open all doors and windows
Turn off the gas at the emergency control valve by the gas meter. Do not turn it on again until advised by a Gas Safe registered engineer
Don’t use any electrical equipment (including light switches) or naked flames
Call The national gas emergency number on 0800 111 999 immediately.
Important safety checks
Never
use a gas appliance if you think that it’s not working properly
cover an appliance or block the
convection air vents
block or obstruct any fixed ventilation grills, air bricks or outside flues.
Warning signs
Your gas appliance may not be working properly if you notice:
yellow or orange-coloured flames (except in fuel-effect fires)
sooty stains or scorch marks on or around gas appliances
a pilot light that often blows out.