I managed to do a bit of checking on this and found that one does not have to spend $60 for the report/book.

It's available for free download here.

I haven't gone over it yet but have talked to a few who have and it refers to the same old TRT etc. case-control studies and does not refer to any debate among scientists on the merits of helmets.

Apparently, in several places it states, "Wearing a helmet is the single most effective way of reducing head injuries and fatalities resulting from motorcycle and bicycle crashes." when the Netherlands shows lower fatality rates per hour of travel due to safer driver behaviour and improved conditions for cycling. It also ignores Robertson's BMJ paper from 2006 that found no significant effect from helmet wearing.

The sad thing I find with the WHO position is the overall health benefits provided by cycling is ignored and the relatively small chance of injury is overemphasized. Mitigation of injury is given higher priority over prevention of injury or the prevention of health maladies. In health terms, one researcher has said that, if the benefits of cycling could be bottled, it would be the most popular drug in the world.