Thanks Luke.
I wouldn't say the existing one faulty as such, since it still works - more that since the terminals are spark eroded more than halfway through, that to replace it when I service it next would be good preventive maintenance, especially given my penchant for driving to remote areas just for the hell of it.
Bob - I'm certainly becoming less and less concerned with making sure everything comes in a blue box these days, as long as it is a reputable manufacturer; given from what I can make of it the quality of the volvo parts for our cars is declining as they change source. (the more recent cars I'm sure they still get their original high spec made)
I suspect we'll see more of the same as time goes on. Waiting for someone to open a box and find a part stamped PPS