EastEnders spoilers follow.
EastEnders boss Chris Clenshaw has revealed what part of The Six story changed since the planning stages.
Viewers will finally get answers the mysterious death involving 'The Six' in an hour-long special on Christmas Day.
Back in February, the BBC soap offered a brief insight into the festive drama, showing Sharon, Linda, Denise, Suki, Stacey and Kathy all standing over a dead body.
Related: EastEnders star Diane Parish was 'gobsmacked' over Christmas Day death reveal
Speaking to Digital Spy and other media at a special EastEnders press event, Clenshaw explained how the story has been 18 months in the making.
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"I think it all started over 18 months ago," he said. "We shot the flash-forward scene the first week back in after Christmas in January, but obviously the planning of that was months in advance, so it's been a long time and it was really weird having meetings before last Christmas about this Christmas and making decisions that you would never have to make until a lot further down the line.
"It was small things, as we were shooting last Christmas and then we were having to make decisions on the Queen Vic's Christmas decorations for 2023, and then we had an opportunity to change the decor from the past previous Christmas from the usual decor that they have in the Vic. It has been a long time in the planning.
"We knew that the Knights were going to take over the Vic, so we felt that Elaine would potentially want some different decorations, so all little things like that had to be thought about much further in advance than usual.
"We did have a very early meeting last October and we discussed, at one point, the idea that their dresses were all going to be in different shades of red, but in the end it just didn't feel right for various reasons and we didn't land on that. We went with individual colours that suit their characters."
Related: EastEnders' Jay Brown to receive surprise Christmas message from Lola
Clenshaw also explained that his team have gone to great lengths to keep the identity of the death victim firmly under wraps until the episode airs.
"I think it's something to watch live on Christmas Day", he added. "I think you'll be guessing up until the very end.
"I think you have to remember that we're a show about family and about community, and therefore it definitely should still feel like Christmas.
"We have gone to quite some lengths to keep everything under wraps, but I can't reveal what those are because then it might be a little bit too revealing. There's been various methods and not everyone knows what they are."
EastEnders airs on Mondays - Thursdays at 7.30pm on BBC One. The show also streams on BBC iPlayer.
