Just a quick update on this-I have replaced the EGR valve, and although the car is a little less sensitive to going into limp mode under harder acceleration, it still does go "limp" on me.  So this was obviously not the cause for this particular running issue-and most probably wasn't even faulty in the first place 
I will be collecting my new brake light switch and the Boost/Thrust pressure sensor soon I hope (It's at Audi-just haven't had the time to get up there!)
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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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