Though classified as self-employed sub-contractors for tax purposes, most bike couriers have in practice a rather more restrictive relationship with the firms that hire them. You may not get a guaranteed income or any benefits, but if you don’t work a full week you’ll generally be out of work pretty quickly. You’re often obliged to wear some sort of uniform or carry a branded bag. The better companies take a deposit for radios and xdas (the palmtop computers on which you receive job details and record signatures) which you get back when you leave, as long as nothing’s been damaged. Last month one of London’s largest courier companies, CitySprint, informed its riders that they would have to fork out £3 a week to rent some new bags they’d ordered. A disgruntled courier leaked the memo: