Gavin and Stacey set on lockdown as Christmas special script confirming major plot is LEAKED

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.

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Nessa, played by Ruth Jones, and Stacey, Joanna Paige on the set of the upcoming finale of Gavin and Stacey[/caption]

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The plot line was accidentally captured in photos of star James Corden holding his script[/caption]

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.

“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.