Retailer Matalan has been asked to reveal exactly how much it has donated to a Bangladeshi compensation fund.

This week, the company bowed to pressure and made a donation to the UN-backed fund to compensate victims of the Rana Plaza factory collapse.

This was one day before the deadline for payments. The compensation fund is still short of its $40m (£24m) target.

The collapse of the factory in Bangladesh killed 1,129 people and injured 2,515 last year.

Many retailers use workers from the country to produce clothes destined for UK shops.

Matalan had been the only large British retailer not to have donated money, according to the campaign group 38 Degrees. They say after thousands of calls, tweets and emails from the public, Matalan agreed to donate a secret sum of money to the official fund a day before the deadline this Thursday.

Hundreds of campaigners are due to gather outside Matalan stores this Saturday calling for the chain to reveal exactly how much it paid in.

David Babbs, executive director of 38 Degrees, which is coordinating the campaign, said: “This week, thousands of people in the North West tweeted, called and emailed Matalan’s bosses to tell them to do the right thing by the people who died in the same factory that made its clothes.

“On Saturday, hundreds of people will take their message to the shop floor.

“It’s good news that Matalan has listened to the public and agreed to pay into the official compensation fund.

“But we’re all still waiting to see whether Matalan has paid up a decent amount of money to help the survivors of this tragedy to rebuild their lives.”

“Until Matalan’s customers know how much it’s contributed, they’ll be wondering why Matalan wants to keep it a secret.”