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)
More meanings of “back door”
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look like a million dollars
to look or feel extremely good, often because you are wearing something that costs a lot of money