I think you're right, but it could be a Sapphire 346 Six-Light saloon, as the Star was not introduced until 1959. If there is a better view ofthe rear wheel spats, and they are cutaway it's a Star.
this car IS a 346 six light, look above the boot handle. the small badge says sapphire automatic. i know because i have three with the same badge. the star doesnt have this