A little looking around seems to show that Halfords oil is made by Comma. One guy on another forum stated that he was delivering a tanker of additive to Comma's plant and asked them and they stated that they did.
The common opinion seems to be that Quantum is made by Castrol.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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