Possibly a little. I got caught a few years ago when they changed my gas meter.
I used to use my immersion heater on E7 in the summer.
During this time no gas consumption was registered, until a new electronic meter was fitted. I then was using about 200 kWh per month on the pilot light alone, so I changed to shutting it down for the summer.
The old meter must have had so much leakage that it couldn't register very low flow.
They have since reverted to another mechanical meter - seems they didn't want to keep changing them when the batteries ran down. :-(
I now have a condensing boiler with spark ignition, but the replacement PCB, just after warranty expired, cost several years energy saving.
Chris