In the United Kingdom the term comforter is not generally used. It is instead called a quilt (or continental quilt), duvet or an eiderdown. A duvet differs in that it is thicker and usually used without blankets or extra sheets.
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McAdder: You're a woman of spirit! I look forward to burying you in the old Highland manner. Farewell Blackadder, you spineless goon! (they leave)
Blackadder: Oh God! Fortune vomits on my eiderdown once more.
BBC. Blackadder, season 3: Duel and Duality
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A cloud of eiderdown
Draws around me softening the sound
Sleepy time in my life
With my love by my side
And she's breathing low
Pink Floyd. A Pillow of Winds
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there were not many things in the world she disliked more than a couch, a good eiderdown couch, that had been made up for sleeping purposes.
J.D. Salinger. Franny and Zooey, p.185 (1955)
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I went to bed, but the presence of the eiderdown quilt, of the pillars, of the neat fireplace, by straining my attention to a pitch beyond that of Paris, prevented me from letting myself go upon my habitual train of fancies.