Update. Got onto VW and got a nice email back giving me a link to their Erwin tech resource thingy. To which one has to subscribe at the basic rate of 4 euros per hour without printing rights, right through to well north of 2k euros for a full year. All I want is a steering ratio! I tell you now, if I wasn't in the polite and refined surroundings of the GTI Forum, I would use some very bad words!
S.M.