Quantum Of Nightmares, the second in Charlie Stross' “Tales Of The New Management” series. Not at all influenced by Mary Poppins, oh no. Feature a Several of the characters from Dead Lies Dreaming and, er, some new ones. Not a Laundry File in spite of what the publisher has seen fit to put on the cover.
If disgraced former International Development Secretary Piggi Patel ever read these books we are doomed. OK, MOAR doomed.