Thanks for the info, yes my plugs are the same as Stevos pc above i.e on the side of the engine not the top. My main concern is how to remove the plug leads, do you just pull or twist and pull. I didnt want to risk damaging something.
Thanks to everyone for taking the time to provide the info.
You pull and twist. Hopefully they will come off without damaging the leads although there is always a slight risk on older cars especially if they haven't been removed for some time.
Take care not to damaged your hands while doing this too, there are many sharp edges around that area.