Heston is a man on a mission, but finding Liam is no bed of roses. Elsewhere, love is definitely not in the air for Zara, but things are starting to blossom between Will and Ben. Sid meets a receptionist who claims she has a gift for matching strangers, but Sid is furious when she goes too far playing Cupid with his patients.
A Valentine's Day episode for you... Tomorrow, obviously, 13:45, BBC1 (and on iPlayer thereafter).