Christmas in Albert Square is never smooth sailing, and this year is unlikely to be any different after the explosive new teaser for the EastEnders Christmas day special hinted at what's to come.The trailer reveals Whitney Dean (Shona McGarty) threatening to expose Gray Atkins (Toby Alexander-Smith) as a murderer ahead of his wedding to Chelsea Fox (Zaraah Abrahams).Talking to Kheerat Panesar (Jaz Deol) about the revelation, Whitney insists that she’s even willing to ruin the big day if it means