I was on Denden (it’s a forum for Spice Girls fans) and they had a video up of this song that is demo from their 2000 album Forever.
The demo is of a song called If It’s Lovin On Your Mind and this song wasn’t on the album. It’s very short, only 28 seconds long, but the song sounds so good. I wish it had been on the album. I’ll post the clip below so you all can have a listen.