Hmm, 20 isn't much, I've probably been looking at really high end ones then. All the prices I saw were 100+ euros.

It's a Clio 1.6 16V, and the Haynes manual says: Bosch RFC 50 LZ 2E spark plugs. 0,9mm gap.
All 4 plugs are powered by their own pen-type coil. Not a single coil for all cylinders. If that matters.

I just checked the manual and it says between 25 and 30nm

Another question: if I buy these plugs will I still have to adjust the gap or will they come pre adjusted ?