I got my discs from GSF down Greenford, I think they were about £120 the pair (345mm) - I haven't got the receipt handy. I had to pay another £12 on top of the price of the 323mm ones anyway, if that gives you a clue.

Incidentally, who was it in the A8 4.2Q "N117 ***" friday last week? Silver it was and looked nice and clean, somewhere near Southall I think it was. I was in a works truck so you wouldn't have noticed me.

Just as a sub-note, when mine were juddering, it wasn't like the pads were contaminated - you know, like a lack of friction judder. This was physical contact/no contact juddering, like the discs were warped big time, it felt a bit like the car was struggling to do the ABS thing as though I was on ice, but I know it wasn't an ABS fault as the light didn't come on and the juddering carried on after I released the pedal, then gradually faded as the discs obviously got cooler. Also, the outer wear band had a hint of blue (over heating) and the pads stunk like worn clutch.

The discs now look like they should, smooth even wear right across the landing zone. They bite really well now too. Shame the gearbox is kaput again...