Welcome to the Big City Gas website – If you need any of these services; repairs to all types of boilers and radiators, maintenance of any gas appliance, repairs to gas cookers and heaters, landlord safety certifications, central heating installations then CALL NOW on Free phone  0800 298 7409 . We cover Hertfordshire/Bedfordshire/Bucks and North London. Fast response with a friendly professional approach.  All work guaranteed. Quality Approved British Gas Contractor. The Big City Gas Company was set up by Steve Mills in June 2005 with the objective of providing quality services at competitive prices to Customers who include: letting agents, housing associations and households in the Watford/ North London area.