I don't know if it is a legal requirement. I have a few friends with them. They had liners fitted to reduce the risk of the victorian chimneys catching fire. Not my area of expertise, but I suspect that the exhaust from the wood burners is significantly hotter than an open fire. None of my friends used insulating granules.
Hopefully someone more knowledgeable will be along soon.
Mine did not with the property I sold nor the one I purchased. They rely on certification provided at install.Solicitors are now asking for a chimney survey if you come to sell and have a wood burner.They will put a camera up and check for a liner.
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