A word of warning. While I have no personal experience with the Bosch +4 Platinum plugs, it seems as though there is a rather large contingent of Dwebbers who have had trouble with them working well in Rover engines. Don't ask me why or how. Do a search on discoweb.org for Bosch plugs and you'll find more than a few threads.
PS I've had very good luck with NGK's.
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