Sorry to disagree Trev241, but scotty76 is correct.
My manual May 2009 registered S4 has the £475 applied.
That is slightly strange there, I pay the full whack for my February 2011 manual S4, I sort of disputed that - but, when and if you ever look at the original build data on the service book, it is meant to declare the carbon emissions - so that kind of ties it down for any individual car. I think that the figure for mine is 234Kg - and that hurts, but what a car, so I soon forget that bit!
Changing the way that Auto Trans cars were assessed for emissions probably meant that the extra money had to come from somewhere, so diehard Man Trans folk are left to pick up the tab or give in to girlie Auto Trans.