Can you put feather duvets in the washing machine / dryer (assuming it is big enough - I would have to go to the laundrette)?
Also: does anyone know of a kind of duvet recycling / reconditioning service? I would prefer one double to two singles and it makes sense to me that if you can clean the feathers (as above) you should be able to re-use them. The ticking on one is falling to bits so it is not really useable as it is anyway and I would prefer to have a double. Does this sound really stupid? There is really nothing like proper down and it seems a shame to throw them away just because, erm, they are ancient and falling to bits... do I have a problem? Maybe...