Gavin & Stacey (2007)

S1E5 Hen Night for Stacey

Stacey's brother, Jason, unexpectedly shows up at home, leaving Uncle Bryn in a state of panic. As Stacey prepares for her hen night, Gavin is busy with two stag nights. During the second celebration, a shocking revelation about Stacey comes to light, threatening to derail the upcoming wedding.