Journey's End Ratings

The BBC are expecting an audience of up to 10 million viewers to tune into the finale of Series 4 of Doctor Who, Journey's End, this Saturday.

Some of their tightest security measures yet have been put into place to ensure that the plot for the final episode isn't leaked before its broadcast.

9.1 million people watched the start of the series, Partners in Crime, back in April, but producers are sure that that figure will be beaten after the shocking regeneration cliffhanger at the end of the last episode.

"There's a limited amount of information on the website about the final episode, but it's fair to say we want to keep it quiet, in fact we want to keep it as secret as possible," a spokewoman said. "We put a block on sending out preview tapes so no-one could find out how it ended, we even chopped off the last few minutes of the tapes for the 12th episode so there would be no clues."