At least 250 people have been killed in the collapse of a building outside the capital, Dhaka where Bangladeshi workers made Western clothing, and scores more are still missing. Police said the owners of factories in the building had ignored warnings about cracks appearing on Tuesday.

Bangladesh has one of the largest garment industries in the world, providing cheap clothing for major Western retailers which benefit from its widespread low-cost labour. But the industry has been widely criticised for its low pay and limited rights given to workers and for the often dangerous working conditions in garment factories.

Andrew North reports for BBC Newsnight on the human cost of cheap clothing, and using concealed cameras reveals that some factories making garments for Western buyers are using child labour.