It's undoubtedly not intended to be. Most people in Europe don't understand the structure of the UK and often just say 'England' when they mean the UK, e.g. in Germany, where "England" usually means 'UK', because "Vereinigtes Königreich" (United Kingdom) is hard to say and no-one says "VK" (/fow-kah/). I have no doubt that it's similar in Greek. (The French have it easier because «Royaume-Uni» is easy to say and idiomatic.)
It's undoubtedly not intended to be. Most people in Europe don't understand the structure of the UK and often just say 'England' when they mean the UK, e.g. in Germany, where "England" usually means 'UK', because "Vereinigtes Königreich" (United Kingdom) is hard to say and no-one says "VK" (/fow-kah/). I have no doubt that it's similar in Greek. (The French have it easier because «Royaume-Uni» is easy to say and idiomatic.)