yup, and as far as he could see there would be no conflict whilst overtaking, because teh van was not indicating
The point is you shouldn't overtake at/near a junction regardless of what it looks like someone will do.
The rule is designed to stop accidents like the OP described above from happening. If the 'chavs' had obeyed this rule then the accident would have been avoided.
Although a pet hate of mine is people who don't indicate (not suggesting the guy in the OP didn't btw).