Depends on the type. mine is brick and I'm having it removed with a hammer and chisel but the brick surround will stay in place.
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I keep making duvet mistakes
I used to buy duvets and they were nice with a little weight and stayed flat but the last few have been so lightweight ( even the winter ones) that they wont stay flat but bundle up in the cover also the fabric isn't like fabric at all more like the paper dresses and knickers from the 60s/70s . I am looking for the older types with prober fabric and a little weight to them.
Help!! please point me in the right direction without having to spend a fortune