Syrian refugee children have been making clothes for British shoppers, an undercover BBC investigation has found.

Panorama investigated factories in Turkey and found children who had been working for Marks and Spencer and the online retailer Asos.

The youngest worker was 15 years old and he was working more than 12 hours a day ironing clothes before they were shipped to the UK.

Marks and Spencer says its inspections have not found a single Syrian refugee working in its supply chain in Turkey.

A spokesperson for Marks and Spencer said the programme's findings were “extremely serious” and “unacceptable to M&S”.

“We do not tolerate such breaches of these principles and we will do all we can to ensure that this does not happen again.”

The representative of the international online retailer ASOS, which also collaborated with the factories where the children have been working said that they were not familiar with the investigation data.