I Have Some “Nagging Questions” About’s Bizarre Commercials

Apparently rolled out this campaign in October, but they seem to be playing the commercials mostly during sports games, so I missed this one until last night, when I rewound and re-played it five times, just trying to understand “Why?”:

Why is the music so sad? Why is she obese? More important: why is she BRITISH? That’s the real kicker when asking WTF about this commercial.