How prevalent is occupational hearing loss in the UK?

According to the Health and Safety Executive (HSE), nearly 170,00 workers in the United Kingdom suffer from the effects of hearing loss due to excessive noise exposures on the job.

Answer Extra: 

While noise-induced hearing loss is permanent, it can be prevented! The HSE offers a variety of publications for employers about administering an effective Hearing Conservation program in specific industries at http://www.hse.gov.uk/pubns/noisindx.htm

source: 
Source: UK Health and Safety Executive http://www.hse.gov.uk/noise/keyfacts.htm