The Series Four run of Doctor Who will take a break for one week on Saturday, May 24 because of the Eurovision Song Contest.
The Radio Times listings for that day show I'd Do Anything from 6.50pm to 7.50pm, the National Lottery draws at 7.50pm and Eurovision following from 8pm until 11.15pm.
Episode eight, Silence In The Library, which is the first instalment of a Steven Moffat two-parter, will air onSaturday, May 31 instead, as confirmed by the BBC Press Office.
The same thing happened last year when Series Three episode seven, 42, was pushed back by a week because of the contest. The previous episode, The Lazarus Experiment, was followed by a 'Coming Soon . . . ' trailer to make up for the disappointment. Whether this will happen tomorrow at the conclusion of The Unicorn and the Wasp is currently unknown.
UPDATE - MAY 20: The official website has announced that a special trailer showing highlights from the rest of Series Four will be shown on Saturday, May 24 at 6.45pm. It will then be available to view online at the official site, where there will also be other bonus treats to help make up for the gap. (NB: The online trailer might only be viewable within the UK.)