Filming for the Christmas finale of 'Gavin and Stacey' is underway in Barry, with original cast members James Corden, Ruth Jones, Joanna Page, and Mathew Horne spotted on set. Notably, actor Oscar Hartland, who plays Neil, returns at 15 years old after having last appeared in the 2019 special as an 11-year-old. This Christmas special marks the first time Corden and Horne have worked together in five years, dispelling rumors of a feud; both maintain they have always been friends. The reunion has excited fans as the cast continues to film key scenes, including a bike accident featuring Horne's character Gavin and Joanna Page's Stacey. The episode is highly anticipated and is set to air on Christmas Day this year, concluding the beloved sitcom.