Looks like Athens has started to use motorists as cash cows just like the UK as the street I am staying on has been hit by the parking police 4 times in a couple of weeks after not seeing any in over a year. They stand to make 240 eurs on this block, double if they don’t pay on time.
I have also seen a number of ticketed cars as I walk around.
For reference a sign with a single vertical line means no parking on that side on odd months and two lines means none on even months.
I am coming here to get away from all that so am very disappointed.