C4 are doing a documentary on it on the 6th, so this is why it's come up again. The shocking quote for me is:
Mr Jennings, from Essex Police's serious crime directorate, said: "We did make mistakes in terms of the crime scene. A lot of witnesses said it was a tragic accident so we believed them at that point." 
Now on BBC too
https://www.bbc.co.uk/news/uk-england-essex-51315670