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Edit: Why do I always put things in the wrong forum? Someone move this.
Same happened to my old 1.6; not melted, its actually burnt. You canuse a dremel etc to clean up the contacts, and use it a bit more. New ignition pack is needed. In my case, it was caused by lousy NGK blue plug leads, riding up off the coil pack.They're a poor fit here.
I think, bizarrely, it was the same part that went on mine, as yours. Fitted a used one for 30 nicker, job done.