out." In filming the "Viking funeral" scene, Haynes wished to film it during the sunset. However, the sun set over the desert, so was instead filmed during sunrise, as the sun rose over the water. Kingston had to genuinely slap Matt Smith several times in a scene because it was difficult to fake. Kingston recalled that after a few takes, Smith got red cheeked and grew frustrated at having to do the sequence over and over again. The Oval Office set was constructed at Upper Boat Studios in South Wales. Because the production crew had access to several pictures and plans of the real office, they were able to replicate it in almost every detail. The main problem for building the set was the plastering; the crew normally plaster one wall at a time for normal rooms, but because the Oval Office was round, they had to do the entire set at once. The American-style diner scene when the companions reunite with the Doctor in this episode is actually located in Cardiff Bay. The Laurel and Hardy film The Flying Deuces, in which the Doctor intruded, was done by Smith dancing in front of greenscreen. Broadcast and reception Pre-broadcast leak At some point before the broadcast of the episode, it and "Day of the Moon" were released in a press screening, where a number of fans were invited to attend. The production team present asked them not to give away any spoilers. However, following the screening, a fan gave away the entire plot of the two episodes on an internet forum. News of this angered Moffat. In an interview on BBC Radio 5 Live, Moffat stated; Despite this he added that the majority of Doctor Who fans are "spoiler-phobes," who refused to go online to be spoiled. Broadcast and ratings "The Impossible Astronaut" was first broadcast on BBC One in the United Kingdom on 23 April 2011 at 6 pm. It began with a still-caption tribute to actress Elisabeth Sladen, who died from cancer on 19 April 2011. Sladen had previously appeared in the series as companion Sarah Jane Smith, and as the same character on the spin-off series The Sarah Jane Adventures. After the broadcast "The Impossible Astronaut" received preliminary, overnight figures of 6.52 million viewers. Final consolidated ratings for the episode increased to 8.86 million, with a 43.2 per cent audience share. This made the episode the second