Inside the secretive world of one of Malawi’s biggest charities - DAPP (Development Aid from People to People). For decades, governments including the US, UK and other European nations have donated many millions of dollars to DAPP for projects ranging from sanitation to teaching. But DAPP has a big secret – it is under the control of a Danish cult-like organisation called the Teachers Group. Simon Cox investigates.

*Since uploading this programme the UK's Department for International Development has suspended payments to DAPP and launched its own investigation*