The NSPCC is calling for an investigation into doorstep charity bag collections after evidence emerged that rogue operators are routinely flouting the law. Millions of pounds are raised each year for charity by private companies who post plastic bags through householders' doors and take away donated items. But 5 Live Investigates has discovered that some firms are illegally collecting without a licence. Others hand over only a fraction of the money they generate - sometimes less than 10 per cent. The Fundraising Regulator says it is looking at tightening up regulations in the sector.