'Cover Up' was not the only song written with Carl Falk that was never officially recorded by Darren but ended up with another act. The second, and I guess most famous one (especially around here), is 'No More Tears On The Dancefloor'. The song ended up being recorded by not only one act but two and even was a single for one of them.
First up are Anders | Fahrenkrog, a pop duo consisting of Thomas Anders of Modern Talking fame and Uwe Fahrenkrog-Petersen, mostly known as the producer of the Nena hit '99 Red Balloons'. They got their hands on the song first and included it on their 2011 album 'Two', releasing it as the second single after the album release. I haven't heard any of their other songs, but interestingly most online reviews for the album specifically mentioned and praised this song.
Here's the full album version:
And the single / video edit which misses the bridge but adds the joy of watching whatever this music video is supposed to be:
Six years later, a British band called Steps, famous for a fantastic run of singles in the early 2000's as well as having pop royalty HRH Lisa Scott-Lee as a member, were looking for new songs for a comeback album. Singer H apparently wrote Darren a message on Twitter, asking if he had something for them to record. Turns out he did - 'No More Tears On The Dancefloor'. Steps included it on their album and even named the album itself after it.
Here's the Steps version:
There's also various live versions in terrible quality on YouTube. Instead of those I wanted to link Darren's demo, which I know is around somewhere, but not on YouTube it seems.
Steps fan that I am I have to say that I like the production of the Anders version a bit more. But that's probably because it's the version I knew first.