It would enable them to extend their visas. It is the extension of the visa that would mean that they could be here longer and therefore possibly open to abuse for longer.
One other thing worth saying is that, of those who sought to extend visas before, there was a whole range of reasons as to why they wanted to do so. The fact that they were victims of trafficking or abuse was not necessarily the only or the main reason why people chose to change employers and to extend their visas. Of course, we recognise that there are huge risks to people who come here. In the Bill we seek to provide methods of having a more secure life for the people who come into our country and who are here because of the employment they have with a particular employer.