Buying Spark Plugs for my Daughters Polo 1.0 L

I've seen Hella for £3, which seems to cheap !

Magnetti are a Fiver, but should I be looking at other makes ?

What is the benefit of Copper or Nickel Electrodes ?

Cheers

I would stick to brands such as NGK as I have never had any issues with them in the past.
I have seen multiple electrode versions but they are more expensive.

Very important that you buy from a reputable source such as Halfords - there are so many counterfeit plugs out there that it could destroy the engine - It costs yes, but you won't need to touch them for tens of thousands of miles