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Coil pack should be an easy job also, seeing as you have to remove the leads from the plug wells to get to the plugs, should just be a case of removing the plug etc and swapping it out.
I’d just do the plus first and see what’s what, if it persists do the coil pack, and then you’re left with...
These should be absolutely fine:
https://www.eurocarparts.com/p/bosch-spark-plug-408772900
0.9mm looks to be the ideal gap for the 1.2 16v with a single electrode plug, which these are.
A torque wrench isn’t strictly necessary but you don’t sound as though you’ve done a lot of this before...
Ok, what engine is the car?
Also, to answer your initial question, yes change all four. Never just one.
If the problems you are describe continue, or even get worse, then it could well be the coil pack, new plugs will likely magnify that.
It’s not that simple, we’d need to know what wheels, different wheels have different offsets.
Fundamentally the size wheel/tyre will fit within the arch, but you’d need offset information to finalise
Absolutely fantastic! Let us know how you get on, and I’m sure tonnes in here will be willing to help.
Now you just have to hope for a consistent enough electricity supply up there to be able to play it 😂