The evidence against Allen was presented to the
Court of Appeal in 2019, with
Max Hill QC, the
Director of Public Prosecutions for England and Wales, taking personal responsibility for presenting the case and arguing for the original acquittal to be quashed. In addition to evidence relating to the Samantha Class murder, the court was also told about the Alena Grlakova murder. Several pieces of evidence were presented; the two similar attacks Allen had committed in Plymouth, Allen's admission that he fantasised about committing physical and sexual violence towards women while in prison, Allen's 2010 and 2011 confession to killing Samantha Class, his threats to harm Grlakova, and footage found on a
mobile phone in Allen's possession that contained images of dead women. The Court overturned Allen's 2000 acquittal, allowing him to be tried again for the murder committed in 1997. At the time it was believed to be the first case in the UK involving both double jeopardy and a double murder. The trial heard that Allen had met Samantha Class on 25 October 1997, and paid her
£30 for sex. The court was told her body was discovered in the River Humber the following day. A pathology report ascertained she had been stamped on, strangled with a ligature and run over by a car before being dragged to the river.
Semen found inside her matched Allen's DNA, while traces of her blood were found at the scene. Testimony from Allen's flatmate at his previous trial was read out, describing how he had taken his clothes to a laundrette the day after Class disappeared. The court was also told that following his acquittal for that crime, and subsequent conviction for the Plymouth assaults, Allen had told probation officers of his "hatred" for prostitutes, whom he described as "scum". One of his victims from the Plymouth attacks also gave evidence to the trial. Evidence was also presented from the Humberside Police operation during which Allen had confessed to the murder while speaking to an undercover officer using the name Ian. The court was told that Allen first met Grlakova at a bus stop in October 2018, while on his way to work, and saw her on a number of occasions after that. She began calling at his flat uninvited, and on Boxing Day 2018 had visited the property twice. Recordings Allen had made of their conversation were played to the court, in which he had angrily told her to go away, and said he would "beat the living shit" out of her if she called again. After killing her, the trial was told Allen had used the internet to search for trowels and shovels, and downloaded
Google Earth in order to look for a suitable location to dispose of the body.
GPS was then used to ascertain that he had visited his chosen location the following day, before taking the body to the Old Slaugh site overnight on 28 December, where he covered it with gravel. Allen admitted to having sexual intercourse with Class on the night of her disappearance, claiming she was the second sex worker he had engaged that evening, and that he had not previously visited a
red-light district before that night. He said that he had spent much of the evening drinking at the Holderness pub before picking her up in his car, and claimed the pair agreed on a price for sex before driving to Walker Street, where they engaged in sexual activity. He then claimed that Class had got out of his car angry because the condom they were using had split and after he refused her request to drop her off, but that she walked away and that he had not seen her again. He did not come forward initially because he said he felt ashamed for using a sex worker. Asked about the sale of his car, Allen said he had sold it in order to pay his flatmate money he owed for a telephone bill. Asked if his reason for selling the car was because of the murder, Allen told the court that it was not. He also denied taking his clothes to the laundrette the following day. Asked about Alena Grlakova, Allen told the court he had met her in October 2018, but had not known she was a sex worker. He said that they had engaged in sex once, but that he did not want her at his flat because he suspected her of stealing two
mobile phones from the property. He told the trial he had ordered her to leave, but had not been violent towards her: "I didn't dislike Alena. She was a pain... and I wanted her out." He claimed to have been "shocked" to learn of her death, and that his internet searches for trowels and shovels were because he was considering taking on an
allotment. ==Conviction, sentence, and appeal==