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According to this tweet there will be a preview of episode 2 in Cardiff on January 8 in the afternoon. The info was taken down from the BAFTA Cymru website but is supposed to reappear later.
https://twitter.com/georgebaker26/status/804052311987339265
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Tickets for this preview are now on sale!
http://chapter.org/bafta-cymru-preview-sherlock-episode-2-qa