TV drama has no certs in the USA.
BBC America and BBC Worldwide have jointly invested in a fourth series of Orphan Black, a Canadian science fiction thriller. The BBC in this country only let two series out. The first episode of Series 4 attracted a total audience of 535k to BBC America in the Stateside overnights.
The Night Manager, perhaps a little more British, backed by the BBC and AMC, joint owners of BBC America, launched on the main AMC channel, and got 933k viewers.