I’m just looking at the quoted power kWh prices a couple of posts back and have had a painful attack of nostalgia.
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Our annual electricity costs are lower than they were in our final year in the UK eight years ago, even if adding current expenditure on buches et granules. And our French house is twice as big!
Our energy costs are less than a third of what they were when we left the UK over six years ago. And energy was a lot cheaper then.
Our costs are huge comparatively. But then we lived in the equivalent of a small cardboard box in london.
Oh you were the ones who bought the flat the size of a wardrobe in Knightsbridge! 
Always imagined you had a rather nice terrace in Islington… 
These units are what are typically used in Florida, where I came from. They work quite well there down to around 3 degrees C or so. Then they struggle and you need to rely on resistance heat strips that really drive the cost up. There they are relatively cheap- I had my last one installed for $4K for a 200 sq meter house about 10 years ago.
Yes we did, and then to move here downsized to a modern cardboard box at Highbury Corner so quick and easy for the Eurostar commute.
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Things have moved on, in Sweden where I first saw them it was below freezing and they still kept the houses warm. I can see where they are not working its really is down to the installers not knowing what they are doing by sizing the emitters properly sized for lower flow temperatures be it underfloor or radiators which allow the heat pumps to perform at their best. The whole install requires technical planning not usually in scope of a std plumber.