BBC2 (most regions) are screening a 90-min. investigation into the modern slave trade, presented by Rageh Omar, at 9pm tonight. (Certain regions will get it at other times.) This interesting-looking programme may help to put the old 18th century slave trade into perspective, and is likely to be a more profitable use of time than the current hand-wringing about our collective inherited guilt. Instead of flagellating ourselves over what happened two centuries ago, let's see how we might be able to help stop present-day slavery.