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its a whole new whopping box that replaces the old one with the spinny metal disc I think.
Ah well, will press the "go" button then.
It's the full meter replacement.
The 'box' is in addition to the meter and is so you can monitor the energy usage on the fly. You can also do this on the myovo page, so my 'box' has been consigned to the back of the man drawer.
We got an ovo smart meter about this time last year. The IHD thingy is plugged in but rarely gets used, not least because I don't trust the numbers it gives in the history view; on the 10-day view the amount you've used on certain days seems to change as the day recedes into the history which is a bit weird. It also defaults to a pointless screen that just says how much you've paid since you had the thing installed, rather than the real-time page or something actually useful.
The "usage" bit on the website changes a bit to show the greater level of detail available, but there's no way to get hold of the data yourself that I've found.