If they had released "I Believe in You" as a single in the week that Ultimate Kylie did come out, they'd have just needed to sell 30,000 copies to beat Girls Aloud, whose CIN-charity single and #1 "I'll Stand By You" was crashing in sales and almost fell behind Destiny's Child's "Lose My Breath" (which that week's issue of Music Week tells us was the longest time at that point a song had been stuck at #2 since "The Loco-motion", incidentally)
Two weeks after Ultimate Kylie hit retail, "I Believe In You", debuted at #2, behind Band Aid's second week at #1, with 39,000 sales. Absolutely robbed.