I think, so far, it's meant to be high drama. There is no humour in the script or anyone's faces. But somehow constant comic undertones persist, as inescapable as they are intangible.
After watching the first episode of Channel 5's Intruder, you might be inclined to believe that it could warm up as it sputters along. It's my sorry duty to report that isn't the case.
It's when the maxim of "show, don't tell" is so laughably flouted, as in the examples above, that you start to fully appreciate the tremendous subtleties of, say, Unforgotten or Line of Duty.
