Maybe I was just really lucky with my instructor(s) but I don't see anything here that wasn't covered while I was learning a year ago. All of it is covered by asking "what if..?" constantly.
Don't wish to rain on anyone's parade, and I'll support anything that helps save lives and limbs, good luck with it, let me know if you ever need inexpert help.
Sorry for taking so long to get back on this... I don't disagree that "what if...?" is the way to go. I don't know whether you have seen it but the DSA (as was) produced an excellent video of exactly that name back in the mid-90s, featuring Suzy Perry as presenter.
Two problems with "what if...?"
Here's the first. "What if...what?". You have to know exactly 'what' it is that you're looking for, to be able to predict what happens next. We learn by experience. Until something has happened, we're not very good at looking into the future to predict an 'unknowable' event.
Here's the second. We look for things that always happen, rather than things that don't happen. If things don't happen, then... well, we just stop worrying about them. It's human nature and well-documented psychologically.
What's the most common crash on our roads? It's the classic SMIDSY with a car emerging from a side turning. The interesting thing is that it doesn't matter where you look (and I've looked at accident studies from the UK, Europe, USA, Canada, Australia, Thailand, Brazil), it's the commonest accident wherever cars and bikes mingle.
So how come the riders we train at basic level to look out for junction collisions still have the same sort of crashes as Thai riders who take no training and carry three people and a cow on a scooter?
It's because even if we are taught that "cars pull out from side roads" on a training course, after a bit we forget to look for that as a possible event because it hasn't happened yet. In fact, some research by James Oullet (who worked on the Hurt report back in 1981) just a few years back showed that Thai riders were better at avoiding junction collisions than both ordinary US riders and the highly trained California police riders! His explanation was because they have to take evasive action all the time so they see it coming whereas in the west it's a much rarer event and we forget to worry about it and get taken by surprise. It's a very practical example of No Surprise No Accident.
The idea behind our simple rhyming reminders is that people can get into the habit of running them through their head when they what Duncan calls 'the affordance'. That is, the 'gap' that's the potential 'trap' where a car could emerge. And if the car 'cango', then maybe it 'willgo'. So with the rhyming reminders, it's the POTENTIAL for the collision that triggers the mental alertness, not the ACTUAL emerging vehicle.