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
O, learn to read what silent love hath writ:
To hear with eyes belongs to love’s fine wit.
(Shakespeare, Sonnet 23)