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Regen has mostly gone. What’s left is intermittent.

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It doesn't sound particularly wrong to me. How far did you drive, you mentioned 5 miles but that is nothing and will hardly warm the battery, especially if you aren't doing a bit of spirited driving either, I hardly ever see full regen in the winter. While it may have been 12c when you were driving, the overnight temperature can make the battery very cold and it will then take a lot longer to warm up.
 
...aaand back to normal. Limited regen initially, but crucially it increased over the course of my journey, never decreased.

I spoke to Milton Keynes SC at lunchtime who confirmed it was being remotely investigated so I’m assuming a turn off/on fixed it.

nb significantly lower air temps today than yesterday.

I’m wondering whether 48.12.1 was remotely installed whereas 48.12 was last Friday’s manual install and whether as mentioned above 12.1 fixes this.