Re: Meanwhile, over at Guido's..
It's likely significantly more than that - I would imagine that each constituency will have 5-10 pamphlet designs depending on the points they are targeting (i.e. candidate info/general Labour info/Brexit/NHS/education/crime/opponents etc). You can't just assume one size fits all. And they are likely ordering 60+ million items all up (averaging 2 items per household - less in some places, more in others)
Having said that, it has been available since October, possibly even September, so I would have expected the majority (conservatively 70%+) of the work to have been done with only changes/new lines of campaigning to be going through for most constituencies plus any stragglers that are less well organised remaining.