There's someone at the back door.
HMI is to be privatised by the back door because the half of HMI who will not be employed by it will have to go and set up as private consultants.
(Definition of “back door” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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to (cause to) move easily through, or along the surface of a liquid, or to (cause to) move easily through air