I got the impression it might be Lilly, not positive though .. they were just praising the show and sorta' said "And here's the song blah, blah".
Found this, but is it a spoof ? ...
Popjustice - Geraldine McQueen - 'The Winners Song'
No its not a spoof, it is being released as a single. It was co-written by Gary Barlow.

