PROTECThear ear plugs
http://www.protecthear.co.uk/product.html

PROTECThear ear plugs are personally moulded from soft silicone being crafted from exact impressions of the individual’s ears. Each pair is manufactured using specially formulated medical grade silicone, to offer the highest degree of comfort whilst providing a highly effective barrier against industrial noise.

Health & Safety Excutive NI
http://www.hseni.gov.uk/index.html

Health & Safety Excutive UK

http://www.hse.gov.uk/noise/index.html
Noise at work Over 1 million employees in Great Britain are exposed to levels of noise which put their hearing at risk.

http://www.hse.gov.uk/noise/advice.html
Advice for employers; The health effects of noise at work & Do you have a noise problem at work?