Hey guys, sorry for the delay in replying.
The EGR is the original 2007 system (though has been replaced with a new unit since)
Think I'll go with replacing the valve again.  for now and see how that goes. 
Hi Marcin, yep S8 front end all sweet now thank you. How is your xenon conversion going?
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07 Silver D3 A/S8L Quattro  S8 front end, Xenons, Bose, Bluetooth, Voice Control, Autodim mirrors, Heated folding mirrors, Double Glazed Windows, Electric Rear & Side Blinds, Black leather Comfort Seats with front memory seats & mirrors, Front & rear heated seats, Interior/Exterior light pack, TV.I.M, AMI, Parking sensors Front & Rear, Air suspension (soon to be lowered), Keyless entry & Start/Stop, 4 zone climate control, Power Boot Open/Close. 
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