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I've only seen the two series, and thought it was enthralling. A very, very clever concept, to keep the viewer guessing about what's going on. The first two series were shown here on free terrestrial TV, but it became so popular that it was then bought by Sky, a commercial satellite broadcaster, for the subsequent series, so I've not seen any more. I'll probably wait until it finishes next year, and then buy the whole thing on DVD.
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