Brilliantly encapsulated in just 60 minutes; not dragged
out over multiple episodes. I also like what he said in the Radio Times piece too: "Why write drama that doesn't matter?"
Why was the brother released after being arrested? They obviously picked him up because he was the registered keeper of the car which was seen on CCTV; but (presumably) if his alibi checked out, wouldn't the police have asked who else had access to the car, who else might have been driving it?