What Happiedays publishes, and what it does not
This page is shorter on specification than the others, and that is deliberate rather than an oversight. Happiedays publishes its page size, 280 by 400mm, and its print area, 250 by 370mm. It does not publish a bleed requirement, an image resolution minimum, a smallest font size or any page count rules.
Every other page on this site would have those fields filled in. Here they say not published, because inventing plausible values would be worse than useless: someone would design to them and discover at the point of ordering that the real rules are different. If you are printing with Happiedays, ask them directly for the missing figures before you finalise artwork.
The margin is derived, not quoted
Most printers publish a margin and leave you to work out the printable area. Happiedays does the opposite: it gives the print area outright and says nothing about a margin. The fifteen millimetre figure on this page is derived from the difference between the two, 280 less 250 gives thirty millimetres across the width, which is fifteen on each side, and 400 less 370 gives the same vertically.
That derivation is checked automatically whenever this site is rebuilt, against the print area Happiedays actually published. If the two ever stop matching, the build fails rather than quietly publishing a wrong number. The methodology page explains how those checks work.
Real newsprint, and paper that changes with page count
Happiedays prints on genuine FSC certified newsprint rather than a brighter digital stock, which is the look most people are after when they order a custom newspaper. There is a detail worth planning around: papers under twelve pages use a slightly firmer newsprint, and those over sixteen pages use a lighter one.
That means the physical feel of your paper depends on how long it is. A short paper arrives with a bit more substance to it; a longer one is floppier in the hand, the way a real newspaper is. Neither is better, but if the tactile quality matters to your project it is worth knowing that the page count decides it.
The size sits between the others
At 280 by 400mm this is a genuine middle ground. It is taller than Newspaper Club's tabloid at 289 by 380mm though slightly narrower, and larger than PrintNewspaper's 260 by 370mm in both directions. The 250 by 370mm print area is comfortable for four or five columns.
Being a Dutch printer, Happiedays is the most practical choice on this site for delivery within continental Europe, where postage from the British printers adds up quickly on a heavy parcel.