Venice Biennale preview

Established in 1895, the Venice Biennale has been called anachronistic - with its focus on separate national pavilions despite the international nature of today's art market. Is it an outdated model? If so, why are more countries than ever taking part this year?

It is a series of exhibitions not an art fair - yet Venice has long been a centre of trade. Just how commercial is its Biennale?

Jan Dalley puts these questions to Jackie Wullschlager and Peter Aspden, and picks some highlights ahead of the 54th Venice Biennale.

Produced by Griselda Murray Brown