Private eyes posed as journalists for Minister

The Daily Telegraph reports today that Justice Minister Jonathan Djanogly “instructed” private detectives to conduct “discreet inquiries" of his aides and colleagues "under the pretext of writing a newspaper article”.
Supposing journalists used private detectives and subterfuge to carry out investigations into MPs? You'd never here the last of it. There might even be an inquiry by the Commons' all powerful Standards and Privileges Committee.