The Replacement

(BBC1, 9pm-10pm) Ellen’s plans to return to work in a couple of months, insisting that she will want to spend more time with her baby. As Paula ingratiates herself with Ellen’s bosses, clients and even her friends, the mum-to-be starts to fear that her new employee plans to become her replacement. Everyone else puts Ellen’s concerns down to a mix of paranoia and pregnancy. Morven Christie stars in a new three-part thriller about a woman who fears she is losing her identity. Architect Ellen (Christie) discovers she’s pregnant shortly after winning a big contract for her firm. She hires Paula (Vicky McClure) as maternity cover, but becomes uneasy when the new recruit dismisses