Original vintage Portsmouth & Gosport Gas Company metal warning sign, issued for use in gas meter or service areas. This sign warns that other meters are connected to the same gas service and instructs fitters to shut off all main cocks, appliances, and lighting burners before attempting to clear any stoppage. The reference to lighting burners strongly suggests it dates from the town gas era, prior to the UK’s conversion to natural gas. Manufactured as an enamelled metal plate with bold red and black lettering, this is a genuine piece of early 20th-century British utility and industrial history.