Broadchurch is actually an ITV production. Independant terrestrial (network?) commercial channel. But there's a lot of cross over in terms of the production companies they use and in terms of casting as well.
ITV and Sky have both really upped their game producing good tv in the commercial sector (Sky = subscription satellite channels). The BBC is hit and miss, but its unique place within the market means it can fail from time to time and continue to produce and to take chances. The commercial channels have had to really push the boundaries in order to carve a place.
Btw: did you see the original British House of Cards? I haven't watched the remake yet, but looking forward to it. I loved the original. In case you haven't, here's a clip:
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