Old Acquaintance: When Lee joins Facebook for the first time and is contacted by an ex-girlfriend from 20 years ago, Lucy is annoyed that she cares so much. Her feelings are complicated by the sudden reappearance of a friend from university, with whom she had a brief relationship. Threatened by fond memories from the past, Lee and Lucy start behaving badly.
Airdate: Fri 29 Jan 2021 at 9.30pm on BBC One
Season 11 Episode 4