What should I do if I smell gas?
Do not operate any electrical switches, use a lighter, smoke, or use the telephone. Turn off the gas at the meter, open windows and doors, warn your neighbours, leave the building, and call the National Gas Emergency Service on 0800 111 999. For LPG boilers, call the supplier's number on the side of the gas tank. (Page 4)
From the official Worcester Greenstar 1000 GR1000W 30C NG Boiler manual, page 4
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