On Sat, 1 Jun 2019 19:31:12 -0700 (PDT), wrote:

Reporting smelling gas gets you instantly cut off & your install condemned, regardless of the cause.

If the leak is on your side.

If it's on the supply side Transco will sort it, they won't leave the
premises until it's sorted or made safe pending a repair.

Had it at my dad's house, meter under the stairs, whiff of gas.
Very old installation, no flexi & thumbscrew valve that wouldn't budge.
Transco came within the hour, confirmed leak with his sniffer. His laptop
showed the gas main was cast iron under the pavement & thought it would
have to be dug up.

Another van arrived, had a look & they decided to saw it off & replace live
as the property was empty.

He told me the main was only about 5 psi. Just needed open windows for a
couple of hours.