The hon. Gentleman raises what is obviously an important issue. Having introduced the Modern Slavery Act, I am pleased to say that between 2015 and 2017 we saw a 52% increase in the number of modern slavery offences prosecuted. There is more for us to do, but we should welcome the change that has already taken place.
The hon. Gentleman asked specifically about a sex-buyer law. Separate to the review of the Modern Slavery Act, the Home Office has provided funds for research into the nature and prevalence of sex work in England and Wales, and that follows a Home Affairs Committee report on prostitution. As I am sure the hon. Gentleman will appreciate, we believe it is vital to have an evidence base before we consider any changes in this policy area. The research that is taking place will be completed next spring.