Well two people spring to mind in that area.
Both have a very good name here.
But I suppose if the mechanic says to you, "Look, your plug lead needs replacing, but I haven't got one in stock, so I'm putting on a second-hand one pro tem (which I'm giving you FOC or only charging a nominal sum); put a new one on ASAP"
then that'd be fair enough. Or would for me, anyway.
If that's what happened.
[Edited on 14-5-2005 by moto748]