Last month, the Daily Telegraph published receipts and expense claims that had previously been kept secret, information that the authorities, to their shame, have even now only released in a half-hearted way, thick with black ink.

BBC: Cameron's data speech in full

The quarter-inch thick device, built by the publisher Hearst, features electronic ink mounted on a flexible microfoil and an 11.5-inch screen, making it the biggest, thinnest e-reader yet.

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