Businesses in eastern England would face severe difficulty without large numbers of migrant workers, a BBC documentary maker has claimed.

Broadcaster Evan Davies has made a film about Cambridgeshire and Norfolk, conducting an experiment to give jobs normally done by immigrants to local unemployed people.

Newsnight's Kirsty Wark talks to two participants in the film's experiment, as well as Immigration Minister Phil Woolas, and Shadow Immigration Minister Damian Green.