A 17-year-old boy from Coulsdon, south London, a 15-year-old girl and two 16-year-old boys, all from Tonbridge, were arrested on Sunday morning on suspicion of murder, Kent police said.

He concludes: “Josie and Shaun Russell blame me for that crime. It really tears me apart thinking they think I did that. That’s the worst part of it. I want them to know I didn’t do that.” Dr Shaun Russell and his surviving daughter Josie moved out of Kent after the murderIn April last year Laura El-Hagrasi was reported missing from her Cliftonville home after failing to board a plane at Heathrow. In just April this year, the parents of Wendy Knell asked the public for help to establish the identity of their daughter's killer. Miss Knell's body was left in her bedsit by the murderer, whereas Miss Pierce's was dumped on Romney Marsh.

As a result of it being leaked, Bellfield goes up the wall. He writes to Kent Police saying ‘it’s all a load of lies – I’m withdrawing it’.”Stone, himself, features heavily – heard in telephone conversations with his long-time barrister, Mark McDonald, with whom he speaks “every day”. Mr Dighton said: "I have still got hope that it will be done and dusted one day and they will catch who did it."

And it is the long-held anxiety over the strength of evidence which convicted him which has prompted the latest TV documentary on the case. Constance Kent went down in history as a cold, calculating teen killer. But the truth of what happened in Hill House Road the night Francis Kent died may remain a mystery. Richard Leivers – the Kent Police officer who saw the dead bodies and carried Josie Russell from the copse when he noticed she was still alive – speaks of the profound impact it still has on him all these years later. “Nothing,” he reflects, “could prepare me for what I saw.” Claire Knights was last seen in Upstreet near Canterbury on Wednesday. It is believed she was walking her dog in the village to Minnis Bay in Birchington, where she was reportedly seen that afternoon. But once the details are established, it is unease in the police case – which would form the basis of Stone’s conviction – which dominate the storytelling in this documentary. It is, for the most part, a well-trodden path. Chillenden was a peaceful, idyllic hamlet before the crime shattered the peace

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But ultimately, the programme drills down to a closer examination of the case against Stone. It is, clearly, far from convinced.

Police arrested Gough on the hunch. Rumors swirled that she confessed — and named father Samuel Kent as her lover. But the nursemaid didn’t confess, and the police eventually released her.In 2017, Stone’s legal team – who admit in the documentary that at this stage they had reached a “dead end” – received a letter from a prisoner who said Levi Bellfield had confessed to the Russell murders. Despite numerous appeals for information and multiple arrests, police have never been able to make any significant progress, leaving his family desperate for answers. But then, earlier this year, Bellfield produces another signed confession – this time witnessed by his solicitor – admitting he carried out the crime.