I was wondering the same thing, we were going along Bayswater Drive at about midday when I spotted the helicopter above junction 1. As we got closer it seemed to be hovering very low above the M53, but shortly after we joined the motorway I saw the incident was on the access road to the golf course.
My wife was driving so I got a good look, there was a police van parked on the rd a silver car slightly behind it and a police car parked at an angle accross the rd and a few police men on the grass. I looked again when we came back at about 2 but there was just a couple of vans parked at the top of the rd. They didn't look like police vans but were just white vans with reflective stripes on the back.
Since I stopped driving I've become so nosey. B)