A couple of the songs were written for Maiden but turned down. "The Lion" and "Silver & Gold", if memory serves. I read that back in 1989 or whenever the album came out, so I could be wrong.
It's not really heavy at all, just kinda... Reach Out heaviness. Adrian rules as a singer, pity he didn't sing with Psycho Motel because the first album (the only one I've heard) really suffers from a lack of a decent singer. The guy doing the vocals is kind of a Bryan Adams/Jeff Keith hybrid and, while that sort of singer might suit the music, this guy doesn't.