With more than 600 main post offices and 18, 000 sub-post offices handling 20 billion letters a year, the service has not only deep roots but strong allies.

ECONOMIST: Post Office

The machine is compact at 1.6m high, 0.9m deep and 2.1m wide, which would make it an ideal candidate for Post Offices which often have under-utilised space that could easily house a book-printing machine.

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