Thousands of foreign domestic workers are living as slaves in Britain, being abused sexually, physically and psychologically by employers. More than 15,000 migrant workers come to Britain every year to earn money to send back to their families. Many endure conditions that campaigners say amount to modern-day slavery. Kalayaan, a charity based in west London that helps and advises migrant domestic workers, registers around 350 new workers each year. About 20% report being physically abused or assaulted, including being burnt with irons, threatened with knives, and having boiling water thrown at them. "Two-thirds of the domestic workers we see report being psychologically abused," said Jenny Moss, a community advocate for the charity. "That means they've been threatened and humiliated, shouted at constantly and called dog, donkey, stupid, illiterate." A similar proportion say they were not allowed out alone and have never had a day off. Nearly three-quarters say they were paid less than 50 a week. "The first thing to understand when we're talking about slavery is that we're not using a metaphor," said Aidan McQuade from Anti-Slavery International. "Many of the instances of domestic servitude we find in this country are forced labour - a classification that includes retention of passports and wages, threat of denunciation and restriction of movement and isolation."