City Gas Service is run by one family and all of their engineers are up to code. They certify any boilers with the relevant paperwork needed by landlords to lease a rented property. They are on the Gas Safe register but can also work with other boiler types too. They install and maintain boilers from Vokera, Baxi, Worcester and more.
Engineers from this company can be called out to give their customers a clear quote. They breakdown the bill to show where the costs are coming from, which can be helpful. Any additional work needed can be discussed with the customer before going ahead.