In the rare instance that a gas meter stops working or you suspect your gas meter is faulty, you should first of all ring the gas emergency service on 0800 111 999. This is crucial to rule out any safety concerns. A faulty meter issue could be caused by the gas meter itself, or something that a gas consumer is trying to do (e.g. attempting to use more gas than the incoming gas service pipe or meter will allow). There is also the potential that there is an issue in the incoming gas pipe from the road or footpath or in the gas mains such as a leak.
Emergency engineers usually attend within an hour. If they deem that there is a fault with the meter itself, such as a faulty regulator, they may turn the gas off and instruct a meter repair be organised. To do this, you should speak with your gas supplier who will then be able to request the meter owner sends an engineer out to arrange a repair or replacement.