In the first reading two Sundays ago (the Baptism of the Lord), Isaiah suggested some elements of Christ’s mission, “ … to free captives from prison and those who live in darkness”. In my homily in our parish, it was said that Isaiah is not necessarily thinking of prisoners who have been convicted by the due and just process of law, but rather captives like the young man, enslaved by a family in north Sheffield, and kept in inhuman and undignified conditions. We know there are many such captives in our country; slaves of gangmasters, of pimps and of so-called ordinary families.Frank Field MP and Tim Weedon (“Vital link to break the chains”, 11 January) wrote about the Modern Slavery Bill which is going through Parliament this month. Would Tablet reader