Hi Franco
Did the screwdriver test against manifold but definitely no spark.
The
distributor I have has a seven pin plug and although I replaced it I did place it back into the car the same way however the fault did not change after replacing it.
I can see that there is a "knock control" bolted near the air cleaner under the bonnet which has a five pin plug attached to a 40 x 40 x 15ml small black box.
Unfortunately I've no luck uploading any photos for you to view.