I've got a 2 phase setup with 2 economy 7 meters fitted - How can I enter the meter readings as one night reading never changes?

Thank you all so much. I am much better informed now about the meter and it's workings. I am very unhappy about my account. I was supposed to move onto economy 7. They don't seem to have done that. 

Yesterday, you said “I am supposed to be on the domestic economy package.” That’s not the same as Economy 7 (E7) - the Domestic Economy plan gives eight hours offpeak while E7 gives … errr … seven, from midnight to 07:00 GMT (so 01:00-08:00 BST).  If you’re on E7, the load control switch icons on the meter display should change sometime between 08:00 and 08:30.

There’s also a tiny difference in the unit rates, probably amounting to less than £2 a year. The extra half-hour of offpeak at breakfast time and bedtime might be well worth it, since all usage in offpeak hours (e.g. while cooking breakfast or warming up the bedroom) is billed at the offpeak rate. 

Do you have a confirmation email or letter telling you which plan you’re signed up to?

I was on domestic tariff. That does not work with smart meter. I was supposed to switch to economy seven but they said wait untill meter was sending readings.  I will fill in on line form and contact OVO when they open on Tuesday. 

Both lights are flashing. It has one reading Tou1 and it says meter balance is £28.69