Gareth Williams, the MI6 code breaker who's body was found naked in a sports bag, which was padlocked (from the outside) and found in his bath, was 'on the balance of probabilities, unlawfully killed'.
I will repeat some of the earlier information.
He was in a sports bag, which was padlocked from the outside.
I think that is the crucial bit of evidence. Forget the naked bit, the MI6 bit, and the bath bit. I think there is a lot more of a chance than 'on the balance of probabilities' he was unlawfully killed.