John Franklin (the main author) is a vehicular cyclist, ie he has often argued against cycle paths claiming that they encourage incompetent cycling. But hey ho.
Here's a parent handbook on the Bikeability standard (the replacement for the cycling proficiency test) that is being taught to their kids so that they can support them post-training, see page 12
https://bikeability.org.uk/manage/wp-co ... ndbook.pdf
Just because you may end up using secondary the majority of the time (as most of us do) doesn't mean it's not 'default'
But, whatever, main thing is we should all feel safe whilst using the roads! I think reminding everyone that cyclists can be in a primary position and the reasons why is important to prevent the oft cited rant about "cyclists in the middle of the road"