Is this my exhaust?

[acemodder]

Im based in Stafford, near Stoke on Trent. Anyone know of a decent cheap garage in the area/local guy who can look at it.

I have just been out lunchtime and the rattling is getting worse.

I'm a total novice when it comes to car repairs/maintenance.

But I think I have ruled out the exhaust, as the rattling is still very evident as its quite warm and I had the window down, it's rattling virtually 100% of the time.

When I got back to my works car park I then parked up, put it in neutral and rev'd the engine not rattle at all.

I have a feeling it maybe the brake disc's being warped? Could this cause the rattling noise? Where the pads rub the disc the circle around the disc is not straight with the edge of the disc and has about 1cm of rough disc where the pad looks like it is not hitting the disc!

This is compared to the other discs, on the other wheels.