I run iridiums in one of my minis that gets used once a year. No problems.

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The bitterness of poor quality (or Crappy Workmanship) remains LONG AFTER the Sweet Taste of Low Price is forgotten.

I run NGK BP6ES plugs in my mini (mild 998) all year round down here in cold old tassie!
Never had a problem and the plugs really need to be changed as they've been in there for a good 15,000kms.
I highly recommend them.
My mate was having trouble fouling plugs in his 73 Mazda 929 so we whacked a set of NGK BP6ES plugs in and 5000kms later still going strong.

Cheers, Rhys

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2000 Holden Rodeo TD - The Daily
1998 JDM Mitsubishi Lancer Evolution V -The Weekender
1977 Leyland Mini 998cc, 1293cc in the works - The project
1977 Leyland Mini Van - Sold
1966 Morris Mini Deluxe - Sold
2004 MINI Cooper S Chilli - Sold

BP6ES and BP5ES plugs also go in some honda mowers i got one last week

Is there any advantage in using BP5EY PLUGS (which have the extended electrode nose) over the standard BP5ES?

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Slide
1965 Mini Van (1360)
1970 Mk2 Cooper S (1310)
1978 Rover SD1 V8 (4.6)
1996 Land Rover Discovery V8 (4.0)

I ran them in the 1412 stroker until we sold it (but they were the resistor version, BPR5EY). Ran just fine, I think BPR5EY are stock AUII falcon plugs so are easy to find.
If you have good plug leads & coil, resistor plugs can give a fatter spark and are less likely to foul.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.