Do you have Level 6 English Proficiency? Level 4 is not sufficient.
As you already have a JAR PPL you don't need to worry about the radio navigation confirmation, as it has always been part of the skills test for JAR. You also don't need to worry about the ID certification, as that would have been provided when you were first issued with your JAR PPL and the CAA will have that on file.
I swapped my JAR licence for EASA nearly 2 years ago, and I called the CAA to clarify the 2 points above and it was confirmed that I didn't need either. So I didn't send in either, and my new EASA PPL was promptly delivered.