Police shot dead four people yesterday in the far north-west of China, bringing to 11 the death toll in a weekend of violence in one of the country's most troubled ethnic regions.

Oil giant Shell is seeking a joint-venture partner for its Nikanassin gas play in the Chinook deep basin in Canada.

Land Securities has announced plans to step up retail developments despite the recent raft of negative news from the high street.

Financial services firms have learned nothing about treating customers fairly in the last eight years, according to the man who regulates the industry – Hector Sants, chief executive of the City watchdog, the Financial Services Authority.

Alisher Usmanov has increased his shareholding in Arsenal beyond the 29 per cent mark.

Land Securities signalled its intention to build more prime London offices yesterday to exploit the prospect of an "even more acute"-than-expected gap between supply and demand.

The luxury group Mulberry has raised profit forecasts for the third time in four months as the well heeled, both in the UK and overseas, snapped up its leather goods.

Virgin Media's chief executive Neil Berkett hailed a "year of great achievement" as it recorded its highest ever annual revenues and bust through the £1bn mark in one quarter for the first time.

Choreographer Jonathan Burrows can spin small worlds out of very little – in his duets with composer Matteo Fargion, he's made intricate and appealing dances out of a few gestures and patter syllables. For this new show, presented as part of Dance Umbrella, he works on similar lines with performer Chrysa Parkinson. Their new work Dogheart rambles more than those earlier duets, with some of the charm but much less focus.

Cyber warfare is a growing threat to Britain, the latest government review of the security services suggested yesterday. After a decade in which the primary security concern has been with the so-called "war on terror" this shift of emphasis is to be welcomed. No one should doubt the gravity of the threat from individual terrorists, but greater potential danger comes from lower-grade but far more quotidian threats. There are more than 1,000 malicious cyber attacks on British state networks every month, the head of the monitoring service at GCHQ revealed recently. They use the same technology that ordinary citizens use to go about their daily business. Nations are using cyber techniques to bring diplomatic or economic pressure to bear on one another. Small scale but significant cyber attacks happen every day.

Europe's new supervisory bodies should not get involved in day-to-day supervision of financial markets, the Financial Services Authority warned yesterday.

Jubilant Energy, an Indian oil and gas group, has decided to press ahead with a London listing on the junior Alternative Investment Market (AIM) this autumn.