Safe Use of Gas
Where gas is concerned, safety is not only relevant to people who have gas installations in their premises. It has to be the responsibility of everyone, as gas pipes run under roads and near non-customers' homes; a gas leak, with the subsequent build-up of gas, could affect anyone.

If you smell a gas leak in the house:
Don't take any chances
Don't light any cigarettes or matches
Tell you flatmates not to light any matches
Extinguish any naked flames – never look for a gas leak with a match
Leave all electrical equipment, including lights alone. Don't switch them on or off as they can spark and may cause an explosion
Don't light a match until you are sure there is no gas in the flat
Check that gas appliances in the immediate vicinity are properly switched off and that a pilot light hasn't gone out, e.g. check gas fire and gas cooker are turned off
Open doors and windows to disperse the gas
If the gas is not from an extinguished pilot light or something left on slightly, then turn gas off at meter. If handle is too stiff to move, don't force it
Call emergency service immediately
If necessary, evacuate the building