I must be missing something. This is one of the worst dramas the BBC has produced in the last 20 yrs. Terrible chemistry (cast took social distancing to a new level), overacted, awful awful script. You don't need to have an inside knowledge of the UK judicial system to know that the Marvel franchise is more believable than this shocker.
Having said that, if you approach it in the same frame of mind as you would watch Snakes on a Plane, you might enjoy laughing at it.