The agency said that online dating, social media sites and fake job adverts online were used as ruses to recruit victims, contributing to a 22 per cent increase in trafficking victims to 2,744 people in 2013 compared with the previous year.
The number of trafficked British children was also sharply up because of reports about the wide scale abuse of youngsters in towns such as Rotherham, Rochdale and Oxford.
The report said that trafficking victims were most commonly forced into sexual slavery.
Police saw a rise in people found put to work at car washes and in the charity bag collection racket.
Systematic use of stamped labels dates from around the fourth century BCE.