Know a couple of places in my neck of the woods (Surrey/Sussex borders) but that's probably not much help! If you've got the head off small engineering firms will often do it for you on the cheap but if a garage has to do it life can be e xpensive depending on the type of car. Is the spark plug still in there or did the thread come out with it?
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I can ask the mechanic next door to our unit.
He services saabs