When I bought the plugs in the link..they were platinum tipped plugs.
I didn't use ebay..I got them from my local motor factors...price I guess around £8 each...the leads I bought from there also.the spark plugs sit deep in the head..after removing the plastic spark plug cover you then.remove 2 small bolts for each coil pack and simply pull them out...I took a picture has always before I dismantle anything...and here is my original picture.
I can't remember what make I chose.
Once the plastic spark plug cover is off see 2 coilpacks remove the 2 bolts...should be 8mm heads on 6mm thread size....marked with yellow arrows in pic below...although I've changed my to allen key heads.
And remove the ht lead and electrical connectors from coil packs marked with the red arrows.before simply just pulling the coil pack up and out.