You didn't say what model disco you have, nevertheless, you can't go much better than what Land Rover recommend. Either Champion or NGK. I have heard that Platiniums are good though I've never used them.
Iv'e been running NGK iridium plugs for the past 5000 miles, and I'm happy with their performance so far. Iridium is 6 times stronger than platinum, so they are supposed to last much longer on DIS ignition systems (60-80k). We'll see.
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