Blair's autobiography "A Journey" leads the way open to a possible follow up called "An Arrival" but, notwithstanding its title, it has sold and sold and sold with figures suggesting it broke all records with nearly 100,000 being bought in its opening week. This despite having to pull out of one public signing and one launch party.
It maybe that Peter Mandelson thought he was being clever by bringing forward his own book to capture attention but sales have fallen away and he has sold only as many as Pete Andre's own account of his marriage to Katy (Jordan) Price et al.
Had Mandelson published after Blair's, he would have sold many more copies. Not for the first time, he couldn't resist wallowing in his own publicity vehicle.