Chloe Green, $4.9 billion
Chloe Green is the daughter of Sir Phillip Green, the CEO of the fashion company TopShop. She's made headlines for dating felons and has had appearances on the show Made in Chelsea. Her father also has a holding with the Arcadia Group, the company that owns TopShop.
Katharine Rayner, $8 billion
Rayner is heir to the Cox Enterprises fortune, a huge multinational conglomerate. She was born in New York and shares her fortune with her sister Margaretta and brother James. She has been married twice, once to a magazine editor and once to a painter.