OK, Jon, thanks for the feedback.
The EGR control is an industry-wide issue, and certainly not unique to VAG products. Thankfully, the FSI petrol engines no longer use EGR, so that's one less thing to worry about!
Cheers
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Sean - Independent Motor Vehicle Technician (retired)
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'07 Audi B7 RS4 quattro saloon 4.2 FSI V8 32v (BNS) (with ceramic brakes) - WOW
'06/7 VW A5 Golf Mk5 GTI 5dr 2.0T FSI (BWA) DSG, fully loaded, colour coded, '98/9 Honda CBR600FX, the blueberry trifle 
'03 Audi B6 S4 quattro saloon 4.2 V8 40v (BBK) 6sp manual, fully loaded (gone, but not forgotten)