The night before Sonia arrived in Wales, Smithy spent a drunken evening with Nessa and neither could remember if anything romantic happened between them.
The next day, Smithy spent the whole day stressed about Sonia’s arrival and acted completely out of character when she arrived, nerving Gavin, Nessa, Stacey and Pam.
Sonia found spending Christmas with Smithy in Wales uncomfortable and left Gwen’s home and him behind to spend Christmas with her family.
She was no match for Nessa, who proposed to Smithy at the end of the Christmas special.
Gavin and Stacey is streaming on the BBC iPlayer and Netflix now