I've had the whole set-up checked at the garage, with the brief to them that I wanted it sorting properly, not on a budget. They have said that the hub threads are good, but the bolts that fixed the spacer to the hub are stretched. They even suggested that I needn't replace the discs, but I insisted that they did.
Short term, I'm just going to leave the spacers off, but I'm sure I'll go back to them, just 'cos I like the look! But I'll make checking the torque a regular job in future!
Thanks for the advice. 
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .
Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).
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