It is the responsibility of employers of bars and nightclubs to ensure they are complying with health and safety regulations.
At the moment employers must act if staff are exposed to noise levels above 80 decibels (slightly less than a loud pub) on a daily basis - some clubs can reach 110 decibels (a plane taking off). But it is up to local authorities to monitor and enforce the rules put in place to protect employees from noise overload.
As for customer's, you are not owed any particular noise nuisance protection by the club as you are not "subjected" to it on a regular basis - you can always leave the club. Environmental health officers may come around to the club to measure sound levels outside because they were concerned about the impact of noise on local residents.



