Switching to a Economy 7 (two rate) plan - how can I arrange this with OVO?

Yes but they can't take on the meter because OVO have not registered the meter correctly on the ECOES. I am now waiting for OVO to update so I can go to another supplier

At the end of my last fixed term contract in January OVO said they could no longer supply a dual rate plan. I was also led to understand that their current smart meter did not do E7 (E10 is a complete no-no apparently). After countless contacts and escalation into the hands of a senior complaints handler it has now been agreed that an SMETS2 5 pole meter will supply E7 rates to my heating circuit. Given there are 5 connection points I am slightly puzzled as to how the installer will do this. My understanding is that there will be 1 live and 1 neutral in and 1 neutral and 2 live out (one of which will be timed through the 5th port). This leaves the neutral for the heating circuit with no home as the supplies as they currently exist are completely separate. See attached image:

OVO seem to have been installing mostly Aclara meters recently, with their model SGM 1416-B being used for dual-rate arrangements. You may be able to make sense of the diagram on p. 8 of the tech manual for this type of meter, which explains how five tails supply two separate circuits.  

Thanks, had a look but not being an electrian I’m still unsure how one neutral out supplies two physically separate circuits. Two live outs, one of which is timed for the heating circuit is clear but I can’t see how the heating circuit gets its neutral to complete it’s circuit. 

I’m sure @BPLightlog can explain ...

😁

The neutral is a common conductor so is used for both circuits. The separate live conductors effectively become live at different times providing the switch between both. 
Neutral being low (near zero) voltage doesn’t need to be switched

Thanks for pitching in 🙇‍♂️
I would think in this sort of scenario that the ‘main’ circuit was always live, with only the off-peak one being switched on and off at the appropriate times. 

Yes, the additional switched off-peak circuit feeds the needs of the storage heaters/hot water or whatever as appropriate 

Thanks, what I’m struggling with is that it appears to me that the heater circuit (with its own fusebox) and the main circuit for the rest of the flat are physically separate so I can’t see any way they can share a neutral. I’m fully prepared to believe I may be being a bit thick and hopefully the soon to arrive installers will explain all! I have attached a photo.

The main input into the building would bring the common neutral in and that connection, wherever it is picked up will provide the ‘return’ connection for the live circuit. 
Will wait to see the result