HSE Publications
http://www.hse.gov.uk/pubns/books/hsg51.htm

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Methods for the Determination of Hazardous Substances (MDHS) guidance
http://www.hse.gov.uk/pubns/mdhs/index.htm

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Pesticides - information and guidance 
http://www.hse.gov.uk/pesticides/index.htm

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HSE's leaflets about Pesticides 
http://www.hse.gov.uk/pubns/agindex.htm#pest

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Transport, storage and manufacture of explosives (including fireworks)
http://www.hse.gov.uk/explosives/index.htm

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Leaflets - Chemicals
http://www.hse.gov.uk/pubns/chindex.htm

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The National Chemical Emergency Centre
http://www.the-ncec.com

A new leaflet produced by the HSE entitled 'Working with Substances Hazardous to Health' has been written mainly for employers in small businesses to help them meet their specific duties under the Control of Substances Hazardous to Health (CoSHH) Regulations.
http://www.hse.gov.uk/pubns/indg136.pdf