[stianan]

Right, the key III is the parallel major. I'm shifting the base of the notation for this passage. When I say III ends the build up, I mean III in the parallel major key, i.e. V(7) in the original key.

[cynicalkane]

III is the relative major. I is the parallel major. As I said, I believe there is no III anywhere in the song.

[stianan]

You're absolutely right. In my native language, the relative key is called the parallel key. Sorry for causing confusion.

So, to clarify, I'm not claiming there is a III in the original key, I'm referring to the III chord of the relative major key.