THE Beeb has ramped up security on the set of the Gavin and Stacey Christmas special after a major plot point was leaked.
The bombshell information was accidentally captured in photos of star James Corden holding his script.
It happened as the 46-year-old, inset, who plays Smithy, was filming in a department store for the BBC sitcom’s grand finale.
The crew and cast — including Joanna Page, 47, who plays Stacey, and Nessa actress Ruth Jones, 57 — have now been told to keep their scripts under lock and key.
The Sun has chosen not to disclose the exciting storyline in a bid to preserve the surprise for devoted fans.
A source said: “Everyone is excited for the return of Gavin, Stacey, Smithy and the gang so naturally interest is at an all-time high.
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“Every day fans are flocking to the filming sites in Cardiff and Barry Island to see the cast filming and take their own photos and selfies.
“It’s a challenge trying to keep key storylines under wraps but the cast have been reminded to be on alert.”
It comes after images of Smithy wearing a three-piece wedding suit sparked speculation he and Nessa may end up tying the knot following her cliffhanger proposal in 2019’s Christmas special.