Torchwood House (tie-in website)
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A Torchwood House website was launched by the BBC in conjunction with the airing of Tooth and Claw.
Under the "View Lunar Surface" link on the Observatory page, there is a reference to the Tycho crater of the moon being a source of "unusual signals" since 2001.
The "Weddings Quotes" page features a photograph of Bernard Cribbins at a wedding. The site launched more than a year and a half before Cribbins first appeared as Wilfred Mott in Voyage of the Damned.