Stock Aitken Waterman didn't really write songs (Rick Astley). They would just get a few hooks layered, record the vocals and chorus they jotted with a singer-of-the-week, and then hand it off to be pieced together in the mix into a semblance of a song. That's why Never Gonna has those weird breakdowns with the "never gonna never gonna", punching out the instruments and repeating the verse again, an intro that sounds like the chorus, no bridge, no solo, no key change, etc. Because there's not much there.