The whole thing is an absolute shambles.
I remember when Jack and Clarissa came in and it was evident that Jack had a bit of a crush on Nikki, but it seems to have gone full circle. I said this on DS Forums but SW needs to decide what it is, it's either a soap opera or a forensic procedural drama - I am not interested in the slightest in outside relationships, to the point I'm forwarding scenes with Jack and Nikki in. But it's the same with Simone, it was so contrived her partner would be the detective. All too neat and tidy for my liking. I can't stand the whole Jack's family storyline, there isn't any interest. The best episodes were from series 12-18(ish), and then it goes downhill again. Jack running round believing he's Action Man and can solve everything in the world, going off on a tangent, doing his own thing.
I just don't think Silent Witness knows what sort of show it is at the moment, and the murders are taking second place to general lives. It should be the other way around!