Well, since changing the plugs (Denso IK20 s) I've had it out and about, up and down the A21. S'OK, everything smooth, I'd go as far as to say it's moving better with the new plugs in. Whether it is the plug change or the whether the No3 plug wasn't sitting properly and needed tightening I don't know but it sounds better and feels a lot more responsive. Go figure...
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