Looking closely at that ad, I suspect that the actors in it might not actually be doing the singing. (Wynne Evans, in the GoCompare ads is very much an exception in the field. It's far more common for songs to be dubbed in commercials, so that a good face and a good voice can be merged together). So the voice you hear might well be that of an unknown studio singer.
However the blurb below the ad that Mamya has posted (when viewed on its YouTube page) states: "Featuring: Richard Willing (Actor)", with a blank space left alongside "Voiceover:".