Two engineers have visited my house so far to fit a smart gas meter but they dont have the correct fitting, nor an adaptor, to connect to the gas tap. It doesnt seem there is anything we can do about it!
The size of the short copper pipe coming out of the flange and going into the lead pipe is 0.795 inch / 20mm outside diameter.
The house is 1962 but the gas meter is 1994. I’m suprised that it is so unusal. Anyone know about gas pipe sizes?

Incoming gas pipe