Eurosceptic Tories, meanwhile, are arguing in favour of “repatriating” powers from the EU to Britain, including the Agency Workers Directive, imposed last year at an annual cost of £1.8 billion, which is putting at risk 28,000 temporary job contracts for those aged between 16 and 24. Tesco has asked one of its suppliers to take advantage of a loophole in the law which allows workers to “opt out”.