By Jasmine Allday EastEnders fans have worked out how Whitney Dean will depart Walford for good. Tonight, Whitney – played by Shona McGarty – was questioned by her best friend Lauren Branning after she found out that Whitney had paid off Britney’s mum to informally adopt her. Whilst Whitney and Zack are licensed foster parents, she was adamant it would take way too long for the formal process to go through and decided she’d pay Britney’s mum to take her off her hands. Britney is now back in Walford alongside Whitney but she is struggling to settle in and can sense Zack is not happy with them b…