What was made crystal clear in the Sky documentary was that Operation Grange was not the back to basics wide scoping investigation which the public were led to believe. Former DCI Colin Sutton told how he was advised not to lead the enquiry as its scope was being restricted. Sutton was scathing of the investigation and the fact that only the abduction theory was being pursued. He confirmed that the parents had not be formally questioned by the Met adding that this was a mistake and should have been done if only to clear them of any involvement.
We only have his word for it and we have no idea whether or not he has misunderstood what he was told. This individual seems to have something of an axe to grind with his previous employers if his blog is anything to go by. Plus he was paid for his input so he had to give Sky some value for money. Pinch of salt time IMO..
When the SY police re-opened ty Ben Needham case I don't recall them going back to Day One and treating his family as suspects anyway. Should they have done, and is it an utter disgrace that they weren't?