Thanks for the replies. The heating has been off. I'm not actually sure if he's swallowed any of the "woolly" material but he may have done as both of my cats always try to steal cotton buds from the bin and chew the cotton wool ends on them! I have washed the bed, sprayed it with Feliway spray and put it back (complete with small hole!), and whilst he hasn't been dragging it round the house or chewing it, he has also completely avoided sleeping in it. Being a too soft cat owner I have ordered a large wicker cat sofa with cushion on E-bay. It looks big enough for them both which I think they'll prefer so fingers crossed!