Yep, it's "Black Is Black" by Spanish rock band Los Bravos. Because they weren't fluent in English at the time, they had to learn the language phonetically for the song.
Because of that, Six Flags have banned him from all of their theme parks. By that, I mean he ate McNuggets while on a roller coaster at a Six Flags theme park when he shouldn't do it for safety reasons.
In 2004, the British retailer overhauled their identity by going by their initials M&S or Your M&S. Twiggy would do the narration for several adverts during that period.