Hi John,
Yes you are correct. Each coil pack sits on top of one plug with an extension lead to a second plug. It's a wasted spark system as both plugs that share a coil pack fire at the same time.
You can fit two types of plugs, Iridium tip or normal tip. Iridium are good for about 30- 40 k miles, normal about 10k miles. Eurocarparts sell both types, I've just fitted the Beru plug they list and they are fine. I removed the Bosch 4 prong "thing" they also list at about £5 each, also fine. Nothing wrong with the "normal" plugs at about £3 each, but if you hate doing the job maybe Iridium are for you, but expect £14 each per plug.
My main issue was the plug spanner as they are small plugs, motorbike size. Halfords sell a plug socket if you need one.
Easy enough job, just remember what order things go back.
Mike
Yokohama Geolanders, Sony head unit, NAUTILUS Air Horn, DRL conversion, Rear cargo space, Elvis Bobblehead, transfer Guard, Indian hanging Elephant, Koni Heavy track dampers, Custom SS exhaust, Voodoo Doll, Adventure Rack with LED ight bar, vintage ERIBA caravan usually attached (yes it's slow)
