The Occupational Health Service monitors the hearing of any member of staff exposed to loud noise in the course of their work.  Under the Control of Noise at Work Regulations (2005) staff who require hearing tests will be identified through the risk assessment process and will attend Occupational Health annually for the first 2 years and 3 yearly thereafter, or sooner if indicated.  This will detect signs of any problems to allow appropriate action to be taken to prevent any further deterioration.