A top prosecutor who sealed the conviction of Alesha MacPhail 's teenage killer has told how he will forever be haunted by the case.

Iain McSporran QC revealed he unnerved as he cross examining twisted Aaron Campbell, 18, as he span a web of lies over the rape and murder of the six-year-old schoolgirl on the Isle of Bute in July 2018.

The 56-year-old said recalling the harrowing details of the case takes him to "the most horrible place".

Aaron Campbell was convicted of Alesha's murder

Discussing his most memorable case on the Hey Legal quiz streamed on YouTube, the brief said: "The most memorable for all the negative reasons is the prosecution of Aaron Campbell.

I will never be able to rid myself of the feelings I have for that case and I'm sure I'm not alone.

I know that police officers, even the pathologist giving evidence was almost in tears. The defence counsel and agents I know were also affected, and will be affected by that case.

"You think you’re inured to it, but you’re not.

"I know that every time there’s a newspaper article or something on television about that case and I see the photograph of that beautiful wee girl, it just takes me back to the most horrible place.”

Alesha was just six years old when she was murdered by Campbell on Bute

Campbell was 16 when he abducted Alesha from her bed at her grandparents’ home on Bute.

The schoolgirl, from Airdrie, had been staying on the island with her dad for the start of the summer holidays.

After sneaking into the attic flat with the intention of robbing Alesha's dad of cannabis, Campbell found Alesha sleeping and carried her to woods, where he raped, strangled and suffocated her.

He left her naked body, which had 117 injuries, to be discovered by a member of a search party the next morning and set about trying to cover up his brutal crime.

Mr McSporran said Campbell's performance in the witness box left him doubting his own skills as a prosecutor as he skillfully dodged his questioning.

QC Iain Mcsporran

He said: “Bizarrely, perhaps the selfish thing about that case is that, despite thinking I have a reasonably good cross-examination style, I have to acknowledge that I was completely confounded by a 16-year-old boy.

“That makes you think: ‘What skill set do I have if he was able to resist any of my apparent skills?’ That’s a case that will never leave me.”

Alesha mum Georgina Lochrane warned that Campbell would kill again as his minimum sentence was slashed by three years in 2019.

Georgina warned Campbell will kill again

She told the Record of her fury as appeal judges reduced the punishment part of Campbell's 27-year sentence to 24 years – meaning the fiend could be considered for release at the age of 40.

Georgina, 25, said vile Campbell had succeeded in “playing the system” and she fears for the next generation of children who will be at risk when he is released back into society.

She has since set up a fundraising organisation, Alesha's Beaming Smile, to help other struggling families in her daughter's memory.