I had one put in at our old place by OVO. It was a bit of a faff to get them to turn up, in the first few months the cost went up by 10-15% weirdly.
The bloke who fitted it gave me a tablet thing then they sent another in the post. I think opened one lost interest and chucked it in a draw, I think the other went in the bin.
Can't say I'd bother with one again.
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