Full details are given here:
http://www.tvadmusic.co.uk/tag/sainsburys/
"There are three ads in this “By Sainsbury’s” campaign (Breakfast, Sausage Sandwich, and Apple Pie), each featuring a different cover version of Kylie Minogue’s Can’t Get You Out of My Head. All three covers were created by the Soundtree music production company for the AMV BBDO ad agency. Two of the covers are performed by Megan Wyler and James Riley. Megan will release her debut album in June, while the James Riley Band recently released a debut EP. As for the third cover, Soundtree can only tell us that it is performed by “a secret guest singer”. The Soundtree versions of Can’t Get You Out of My Head aren’t commercially available.