Kia, you need to look at the wiring when you go on holiday -only we use black-neutrals in the UK, and not any more in flexes , at least officially.
Old east europe colours.
red/black/grey => red earth, black live, grey neutral If this gets confused with old UK colurs it can be fatal, which is why Polish and East German leccies wince at ythe idea of a live red wire.
West europe post war colours
Black blue green => blacklive, blue neutral green earth
old UK colours
red/black/ green, =>red live, black neutral, green earth
Harmonised colours
Brown balck or grey, live
Blue neutral
green/yellow strips earth.
The black/white green is american, and black (or red) are hots, white is neutral and green is earth.
Now you see why we needed harmonised colours....
But as has been said, on a two core european flex, who cares, the plugs are reversible, and the appliences are designed to take that.