Everything, therefore, is bespoke — from the furniture to the wall coverings to the duvets. Norwegian duvet company Norvegr, for example, sells a £27,600 duvet that, it says, is popular with celebrities, royals and the super-wealthy. Each is tailor-made for its owner, based on a sleep consultation, and made from eiderdown hand-gathered from abandoned nests on Svalbard. It is designed to last almost 100 years, if restored every decade (this costs an eighth of the retail price, so roughly £3,450 each time).