The chap with the slit throat is an undercover officer that was ingratiated into a gang, he was probably found out. I was of the mind that the gang were smuggling the child at first but that seemed to be a bit of misdirection when the raid on the farmhouse was fruitless, this was probably so that the gang could find out who the mole was. Then killed him.
As for the chap at the hospice, I've no idea what he's got to do with anything, he's a friend of the wife's that got a kicking for crossing the line by the sounds of it.
I don't like Ken Stott being a probable pervert.