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               Originally Posted by 
              Pleiades  
              Spark plug socket sizing is a bit confusing! Yes, it is a 16mm socket (to fit the flats on the plug), but it's for a 10mm plug (that's the plug's thread). So, yes, the one in the link is what you need.
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         Got that one from Halfords. Taking the spark plug out now is a walk in the park. Thanks Pleiades.