The clock is ticking for several EastEnders favourites, counting down to a week of drama, where everything will change. A chilling new trailer for the BBC soap has been released, announcing a week of special episodes. In the trailer, some of Walford's biggest names appear to be gathered in the pub in their finery. They're all enjoying a drink until the clock hand moves and David Bowie's 'Changes' plays. Everything starts to tilt out of place and sirens can be heard before four characters -