Well,

Not having much luck fellas.

On the way home tonight it developed a nasty noise:

Not the engine - sounds sweet.
Don't "think" it's the gearbox (at) as it shifts smoothly as normal.
Not suspension / drive train, as I can make the car make the noise in N & D. I have to rev it to maybe 3k though.

Noise is a tinny metallic rattle, most prevalent when giving it power under load, circa 1500-3500rpm. It could still be making the noise over 3500, but is probably getting drowned out by the engine by then.

I'm kinda suspecting exhaust? Maybe a baffle or buggered cat?

Any ideas guys, or have you had anything similar?

Thanks in advance as usual.