Engine Bay Rattle Noise - Help Needed

[B333NJY]

Hi guys, fairly new to the forum but have had my 197 a few months now so thought I'd post this query up.

After I rev the car, be it hot or cold I get this strange rattle noise when the revs die down.
The noise as far as I can recall has always happened, the car has a solid rear engine mount and has had the cambelt/tensioner/aux belt & water pump all done at Birchdown. The noise was there before I had the cambelt done, so I don't believe this to be the cause. When the belts were done I was told that the dephaser was fine so didn't need replacing.

I have attached a video of the noise, if anybody can shed some light on the subject then I would be most appreciative as I'm worried about my poor car

Thanks Guys!

http://s716.photobucket.com/user/B333NJY/media/IMG_3203.mp4.html

 

[MicKPM]

Tricky one that as the sound isn't great (Maybe this end at fault there).

Assuming all engine mounts are intact and bolted down correctly whip the aux belt off and briefly try it again... Noise gone = something on aux belt run (A/C Compressor, Alternator or DCP), noise still there = something else

Mick