Carol Morgan: How a love affair led to a murderous plot

In 2019 Margaret was heard to say “Shush”, indicating she thought they were being taped. He said: “I am sorry” and “I don’t want to say anything because they might have…”

In a letter Allen wrote to Margaret that same year, after they had been arrested, he said: “Trust works on both side. If I didn’t trust you, you wouldn’t be here and I would not.”

Det Supt Foster, who came out of retirement to finish the case, said: “I don’t think you need to be a police officer to listen to those recordings and think if you’re innocent and haven’t done anything why are you shushing each other and making comments like ‘they might be recording us’?… if you’ve got nothing to hide speak freely and openly.”

The couple were charged last year, and underwent a two-month trial at Luton Crown Court.

Morgan, now 73, faces a lengthy prison terms after being convicted of conspiracy to murder.

Margaret Morgan was found not guilty of the same charge.

The killer, who has never been caught, used an axe or machete to attack Carol.

Det Supt Foster, who came out of retirement to finish the case, added: “In the absence of a confession, we may never know who carried out the physical act of murdering Carol.

“However, we will do all in our power to secure new evidence and bring them to justice.”