Something is way off about Ifield. He appeared to be a dedicated forensic officer who probably wanted to be a detective, but he turned very easily into something much more sinister when he thought Roz was dead. Surely it takes a special kind of mindset to even consider going to get an electric saw to dispose of body
I thought this, but my DP thinks he just panicked. He has a precise and logical mind, meaning he was able to think through disguising himself, buying all the right stuff, etc, but when it came to it he wasn't really a killer –or would have killed Roz only out of desperation and panic.
£150k for a bracelet! What's this? 
I think Hastings suspects Maneet, as he should. In fact the others should too - the department's leaking and she goes off unexpectedly early on mat leave? Does he? He came down pretty hard on Jamie and didn't seem interested in exploring other possibilities. Did Maneet just go off on leave early; she hasn't left the team or anything?
Was it wrong of me to laugh when Lakewell called Arnott Ironside? That made me snort too. 
I don't get why the infection would be MRSA, or why it might be significant.
I also don't understand what Roz was doing with the hairbrush – whose was it?
Roz was eriously delusional/irrational going on about a divorce and how him 'letting' them amputate her arm was grievous bodily harm. Is she genuinely delirious through pain/painkillers, or does she realise she's being cornered and has gone right on the offensive?
I'm very sceptical about them dragging Hastings through an investigation/disciplinary on the basis of someone blinking twice, when practically everyone in the place has a name starting with H. Is it just me or is this series slightly jumping the shark?
On another note, hot DAMN Ted looks hawt in his police-issue coat.