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I've just had a phone chat with Workshopping about those lightweight jacks and the saddle height at the jacking point is the critical measurement.
The guy I spoke to was extremely helpful and not at all a hard-sell but more interested in a customer getting what they actually need. He reckoned that a Mk5 Golf would be fine on a 1.5 tonne rated jack especially as the jack wouldn't be lifting up the whole car!