@Mortimer

You're right about that. Everything up to the meter is the responsibility of the Distribution Network Owner (DNO). The metering itself is the responsibility of your supplier. Everything forward of the meter, or disconnect if fitted, is the responsibility of the consumer. There is a degree of overlap but there never seems to be any 'joined up thinking' when it comes to situations like yours.

The solar installers should have coordinated with both the supplier and DNO to ensure that the metering system was fit for purpose and any changes should have been implemented at the same time, or prior to, the solar installation.

When commissioned, the system should have been validated to ensure that the metering was working correctly. That's my opinion at any rate.

Don't shoot me, I'm only the piano player. I DON'T work for or on behalf of EON.Next, but am willing to try and help if I can. Not on mains gas, mobile network or mains drainage. House heated almost entirely by baby dragons.