Post Office Vans

I was in the newsagents the other day, and a couple of Post Office vans were parked on Lion Street, which is the closest they can get to the back door of the Post Office, where the post is taken in and out. They park on the double yellow lines, and block the street while they're there.
Margaret was not happy about it. She sees it most days, and she'd had enough of it.
"It's not the boys from Hay," she said. "They park round the corner. It's the boys from Hereford."
So she had rung up one of the managers in Hereford to complain.
He was less than sympathetic. "There's nothing you can do if they're legally parked," he said, according to Margaret.
But the whole point was that they were not legally parked. Margaret told him exactly what she thought of him, and slammed the phone down.
A little while later, however, the vans were moved....