Mark - have a look here: http://www.howtohaven.com/system/slipstream-xp-service-pack-3.shtml

It's a generally good process anyway, which you should do for next time, but it also includes direct links for things like SP3.
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock