A team of BBC journalists was given high-level clearance to investigate serious sex allegations concerning Keith Vaz last year. The special unit was led by a reporter who specialises in sex crime stories. It interviewed a number of witnesses and found evidence that Vaz had cheated on his wife with young men. The team was reportedly given significant resources and director general Tony Hall was informed – unsurprising given the high-profile target and in the wake of the Newsnight / Lord McAlpine debacle. The investigation also looked at a number of as yet unpublished allegations. Wonder what they found? And why the programme never aired…