Data from Gas Safe Register’s Investigation’s Team has revealed the top 10 cities in the UK at risk of living with dangerous gas appliances from illegal gas work.

The data highlights that central London tops the list with three quarters (75%) of illegal gas work was found to be unsafe. Additionally, The London Fire Brigade’s latest figures highlighted that, in 2017, firefighters were called out 569 times for carbon monoxide related incidents.


The top 10 unsafe cities with percentage of unsafe illegal gas jobs, as researched by Gas Safe Register, are as follows:



  • 75% - London (Central)

  • 72% - Nottingham

  • 71% - Sheffield

  • 70% - London (Outer)

  • 69% - Manchester

  • 67% - Ipswich

  • 66% - Cardiff

  • 66% - Norwich

  • 62% - Edinburgh

  • 62% - Birmingham


During 2017, the Health and Safety Executive (HSE), the national independent watchdog responsible for the prosecutions of unregistered gas engineers, has issued more than £800,000 in fines and prosecutions have resulted in a combined 5 years of jail time.Gas Safe Register’s research found that, within the last five years, two thirds of gas work carried out by illegal gas fitters across the UK was found to be unsafe. However, in the last year, this figure has increased to almost seven in every 10 appliances investigated (69% since April 2017).