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.
I run the Bosch Platinum +4's on mine. I use them in conjunction with the Magnecore 8mm plug wires. Have heard good and bad about them but I love mine and will do it again when the time comes.
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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