About 18 of us various ages from 30 to about very old, rode one of their organised rides at the weekend, excelent organisation and well led, oh and its FREE.
That wasn’t Bikeability, that was our company with a slightly similar name 😀 And we have another couple of cracking routes coming up after being out on a recce today!
And as for the OP, if a child isn’t able to ride one handed and signal, then it isn’t safe to take them out on the roads. We don’t do any stuff like “high five”, we actually test them on signalling. It is really difficult to continue including a child who isn’t able to do this, as the instructor will probably have another five children who can, and need to be able to continue with their training. We usually spend an extra 15 minutes or so, working on signalling with “wobbly” children, and that’s often all it takes to get them doing it ok.