Gas SM then began working, but not the E SM. More enquiries to FU and if I agreed they would send an engineer to swap the E SM for another. I agreed and the engineer arrived last Tuesday. He said he would have to swap both meters and the indoor display too. Both meters and display were swapped out for _identical units_.
Gas SM then worked with display, but not the E SM. Engineer said it might take 48 hours before it all worked.
E SM and there web site consumption still not working properly yesterday, 6 days later, so I rang FU late afternoon - who said engineer was wrong, it could take 28 days. Come around midnight, when data is exchanged - the E SM suddenly began to work.
Coincidence - probably not, I had exactly the same delayed operation when OVO originally installed them, until I rang OVO to complain they were not working, then suddenly they began to work.
The _identical units_ suggests that the only difference between OVO SM's and FU SM's is the firmware in the units.
So for less than 50% of the time, despite agreeing to have SM's fitted, they have been none functioning as SM's. Come Nov when my contract with FU ends and I will reassess suppliers, likely the SM fiasco will begin again.