They must have access to tfl online information these days. The PCO Examiners used to go out on motorbikes themselves years ago to find street changes and new Knowledge Points.
It was nice to see that Examiners are more diverse these days. They used to be retired Traffic motorcycle police who had done the Knowledge themselves. You had to treat them like gods and they would routinely insult you - supposedly to see how you would react to how passengers might treat you. it was Ken Livingstone who changed the way of recruiting Examiners to anyone who had done the Knowledge.
I see the C4 program claimed that doing the Knowledge is the learning equivalent of doing a degree in Law or Medicine! I'm chuffed to hear I'm that clever!