You don't need to take breathalysers now but my own opinion Is that for sure some old French policeman will forget or just be awkward and for the sake of a couple of pounds it stops any long delay. Plus with all that German beer maybe it's worthwhile having a check before you drive if you have a heavy night.
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Pulls funny faces at Traffic Lights, Nürburgring, Brands Hatch, Spa & Goodwood...