Crammed into squalid factories to produce clothes for the West on just 20p a day, the children forced to work in horrific unregulated workshops of Bangladesh 

 These are the photographs that show the grim reality for thousands of children in Bangladesh who are forced to work long crippling hours stitching labels into clothes.

Despite improved safety standards in formal factories, unregistered sweatshops like these are not inspected.

While the factories mainly make clothes for the local and Indian market, they also supply well-known and established international brands through subcontracts, which making it difficult for companies to know exactly where all their clothes are coming from.

Photographer Claudio Montesano Casillas has revealed both the shocking lack of safety controls inside some of Bangladesh's unregulated clothes factories as well as the grueling routines of the children that work there.