London is the billionaire’s preferred European residence – study

The combined fortune of the ultra-wealthy has doubled since 2009, and their property portfolio typically includes a £22m London home

Mulberry chief executive steps down in wake of profits warning

Bruno Guillon leaves luxury handbag maker after attempt to move upmarket by raising prices causes shares to tumble

Japanese company named as biggest online retailer of ivory and whale meat

Conservation groups say Rakuten’s website carries 28,000 adverts for elephant ivory and 1,200 for whale products

Slimane proves messiah for Saint Laurent devotees by reworking rock icons

Hedi Slimane’s latest collection for Saint Laurent goes back to the sixties with a mod theme and go-go boots on display

Paris museum offers Picasso a bigger canvas as it prepares for reopening

The €52m transformation of the 17th-century Hôtel Salé has been undermined by delays and controversy over the cost

Suzy Menkes leaves International Herald Tribune for Vogue

70-year-old British writer, one of the Tribune’s most high-profile assets, joins Condé Nast title