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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a piece of cloth with a pattern or picture that is created by sewing or weaving different coloured threads onto a special type of strong cloth