Here is the European Charter of Fundamental Rights, signed in Strasbourg on December 16th, 2007. Explanations here.
The UK and Polish exemption is this protocol.
In my Italian version I seem to have confused a protocol reference to article 6(2) of the Treaty of European Union with the UK/ Polish issue. I will correct this.
My concern while translating was exactly what kind of exemption was sought and won by Poland and the UK. I settled for an exemption from being pursued in European Court, ie jurisdictional. Feedback urged here.
