Guild of master sweeps
http://www.guildofmasterchimneysweeps.co.uk
Be
Carbon Monoxide aware
http://www.becarbonmonoxideaware.com/
Carbon
Monoxide and Gas Safety Society
http://www.co-gassafety.co.uk/
HETAS
http://www.hetas.co.uk/
Northern
Gas Networks
Gas
Leak or Carbon Monoxide Emergency
Telephone 0800 111 999