Bird?
I always said a man in France is judged by the size of his wood pile 
On the basis of personal experience think l’ordonnance is more likely…
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We used them all the time, very little ash and the wood burner glass didn’t get so dirty. Bought in bulk from a local (ish) supplier and managed to get a pallet load in the back of the van so no delivery charges.
Like Angela I was surprised that Sue could not find someone supplying bois de chauffage who would deliver to her and stack as well. We too are in Normandy but are not the only department which has copious amounts of woodland and therefore potential large amounts of firewood too. I can understand not wanting to have to cut firewood to width but most comes in 2 sizes of 1 metre or a half n metre here. And surprised that it’s not widely in available most areas in France. We don’t use the buches as we find really dry firewood gives off more heat and must be better for the planet being rewable and, normally, easily sourced locally a natural product
They are made of waste wood so in theory making use of a waste product may save another tree for a bit longer?
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Have sent you a message Corona
Not sure about that, buches have a high calorific value and a lower moisture level as well as producing less ash.
Heat output from logs varies greatly according to logs’ type and sechage
Can’t beat a bit of well seasoned dry ash. Queen of the woods
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And you can use the wood ash in the garden. Would you use the ash from a buche in the same way? I don’t know?
And, I am told, ash is rare in that it can be burned soon after being harvested. Maybe that’s where it gets its name from. 
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Yes low water content even after felling, still better to store it though. Felled one of mine and tested it.
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We’re fortunate to have a lot of ash trees around the garden here. When a branch or so falls in the wind it makes great firewood when stacked and seasoned. In England our wood supplier provides mostly ash and some beech too, beech makes good firewood bu not as good as ash. There’s a rhyme isn’t there about firewood which says ash is the best.
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I’m using Simply Feu compressed wood bûches, now. Much better than the ones I bought locally.
And briquettes made by Bionex.Fr, which come in fact from Lithuania. They last well - I had one still alight at its core the following morning.
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