MU

Murder Most British

Rachel & Zach

Ep 41 - Blood in the Valley - The Clydach Murders

May 6, 20261h 1m
Summary

In this episode of Murder Most British, the hosts delve into the harrowing 1999 Clydach murders in the Swansea Valley. The case centers on the brutal killings of Mandy Power, her two young daughters, and her elderly mother, whose home was set on fire following the attack. The investigation quickly spiraled into a complex web of local secrets, involving a high-stakes investigation into Mandy’s private life, her relationship with a married former police officer named Allison Lewis, and the subsequent scrutiny of the local police force. The discussion highlights the challenges investigators faced as they sifted through thousands of statements and disputed forensic evidence, including a bloodstained gold chain found at the scene. The hosts examine the intense atmosphere of the trial, where the prosecution’s case against local builder David Morris competed with the defense’s questions regarding the conduct of the Lewis family. Through a detailed breakdown of the timeline, witness sightings, and conflicting expert testimonies, the episode invites listeners to consider the complexities of a case that continues to spark debate and remains one of the most controversial murder investigations in Welsh history.

Updated Jul 6, 2026

About This Episode

“In a quiet Welsh village, four lives were taken in a single night — and nothing would ever feel ordinary again.” In June 1999, the village of Clydach awoke to unimaginable horror. Inside a family home, Mandy Power, her two young daughters, and her elderly mother were found brutally murdered. The violence was concentrated, personal, and devastating — leaving a small community reeling and the rest of Wales in shock. As detectives began piecing together the timeline, the case became larger than one house — drawing intense scrutiny, fierce debate, and years of argument over what mattered most: the evidence, the narrative, and what a jury could be asked to accept. This week, the Archive examines one of Wales’s most significant modern cases — tracing the night itself, the investigation that followed, and the questions that never fully stop circulating around it.

Some crimes fracture a community. The Archive remembers the fault lines — and what was built across them.

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SOURCES — ORDERED BY SOURCE HIERARCHY

COURT OF APPEAL 2005 - REGINA -v DAVID GEORGE MORRIS

https://www.bailii.org/cgi-bin/format.cgi?doc=/ew/cases/EWCA/Crim/2005/1246.html&query=(Morris.)+AND+(R)+AND+(v)+AND+(2005) 

ICO, 11 Apr 2024, IC-259405-LON8 - Freedom of Information Act 2000 (FOIA) Decision notice

https://ico.org.uk/media2/migrated/decision-notices/4029182/ic-259405-l0n8.pdf 

ICO, 7 Jul 2023, IC-209640-X6N8 - Freedom of Information Act 2000 (FOIA) Decision notice

https://ico.org.uk/media2/migrated/decision-notices/4025845/ic-209640-x6n8.pdf 

 South Wales Police Statement - Clydach Murders

https://www.south-wales.police.uk/news/south-wales/news/2021/january/south-wales-police-statement---clydach-murders/ 

South Wales Police — response to BBC Wales documentary (9 Nov 2020)

https://www.south-wales.police.uk/news/south-wales/news/2020/south-wales-police-response-to-the-bbc-wales-clydach-murders-documentary/ 

The Observer / Guardian — “The valley of death” (4 Jul 1999)

https://www.theguardian.com/uk/1999/jul/04/theobserver.uknews1 

The Independent — “Man ‘massacred family of four after sexual rebuff’” (23 Apr 2002)

https://www.independent.co.uk/news/uk/crime/man-massacred-family-of-four-after-sexual-rebuff-9211280.html 

The Independent — “Collapse of juror halts family ‘massacre’ trial” (24 Apr 2002)

https://www.independent.co.uk/news/uk/crime/collapse-of-juror-halts-family-massacre-trial-9146047.html 

The Guardian — “Ex-police officer tells of death of lesbian lover” (7/8 May 2002)

https://www.theguardian.com/uk/2002/may/08/sarahhall 

The Guardian — “Life for three generation murderer” (28 Jun 2002)

https://www.theguardian.com/uk/2002/jun/29/ukcrime.sarahhall 

The Independent — “Life for killer who beat family of four to death in fit of jealous rage” (29 Jun 2002)

https://www.independent.co.uk/news/uk/crime/life-for-killer-who-beat-family-of-four-to-death-in-fit-of-jealous-rage-182076.html 

The Guardian — “Conviction quashed in case of four murders” (4 May 2005)

https://www.theguardian.com/uk/2005/may/04/ukcrime.helencarter 

The Independent — “Man convicted of murder did not get fair trial due to lawyer’s conflict of interest” (4 May 2005)

https://www.independent.co.uk/news/uk/crime/man-convicted-of-murder-did-not-get-fair-trial-due-to-lawyer-s-conflict-of-interest-495031.html 

The Guardian — “Four life terms for family killer after seven-year legal battle” (17/18 Aug 2006)

https://www.theguardian.com/uk/2006/aug/18/ukcrime.martinwainwright 

The Independent — “Former builder guilty of family ‘massacre’” (17 Aug 2006)

https://www.independent.co.uk/news/uk/crime/former-builder-guilty-of-family-massacre-412304.html 

The Independent — “Man who murdered three generations of a family gets life” (18 Aug 2006)

https://www.independent.co.uk/news/uk/crime/man-who-murdered-three-generations-of-a-family-gets-life-412386.html 

The Independent — “Police speak to ‘new witnesses’ over brutal murder of family after TV documentary” (11 Nov 2020)

https://www.independent.co.uk/news/uk/crime/clydach-murders-mandy-power-documentary-new-witnesses-b1721208.html 

ITV Wales — “Police commission independent forensic review of Clydach Murders evidence” (19 Jan 2021)

https://www.itv.com/news/wales/2021-01-19/police-commission-independent-forensic-review-of-clydach-murders-evidence 

ITV Wales — “Man convicted of the Clydach murders David Morris has died in prison” (20/23 Aug 2021)

https://www.itv.com/news/wales/2021-08-20/man-convicted-of-the-clydach-murders-has-died-in-prison-it-has-been-announced 

The Guardian — “Clydach murders: police review claims sock links Dai Morris to scene” (18 Oct 2021)

https://www.theguardian.com/uk-news/2021/oct/18/clydach-murders-police-review-claims-sock-links-dai-morris-to-scene 

ITV Wales — “Clydach Murders: Key forensic evidence found on sock during review” (19 Oct 2021)

https://www.itv.com/news/wales/2021-10-18/key-forensic-evidence-found-on-sock-during-review-of-clydach-murders 

The Independent — “Clydach murders: Blood-stained sock ‘supports’ conviction of Dai Morris for 1999 killings, police say” (19 Oct 2021)

https://www.independent.co.uk/news/uk/crime/blood-sock-david-dai-morris-clydach-b1940688.html 

Sky News - Clydach murders: Blood-stained sock links David Morris to scene of killings, police say

https://news.sky.com/story/blood-stained-sock-links-man-convicted-of-clydach-murders-in-forensic-review-12437760 

ITV Wales — “Family call on supporters of Clydach murderer David Morris to accept his guilt” (9 Nov 2021)

https://www.itv.com/news/wales/2021-11-09/family-call-on-supporters-of-clydach-murderer-to-accept-his-guilt 

Evening Standard / PA — “Family call on supporters of murderer to accept his guilt” (8 Nov 2021)

https://www.standard.co.uk/news/uk/david-morris-south-wales-lewis-swansea-stephen-b965066.html 

Sky News — “‘I became the devil’: Trauma of woman wrongly suspected of murdering an entire family in Clydach” (29 Jan 2022)

https://news.sky.com/story/i-became-the-devil-trauma-of-woman-wrongly-suspected-of-murdering-an-entire-family-in-clydach-12527037 

ITV Wales — “Murder in The Valleys: The true story of the Clydach murders - Wales' biggest police investigation” (9 Feb 2022)

https://www.itv.com/news/wales/2022-02-09/the-true-story-of-the-clydach-murders-wales-biggest-police-investigation 

The Standard - Chain of lies led to Morris

https://www.standard.co.uk/hp/front/chain-of-lies-led-to-morris-6310564.html 

The Observer / Guardian — “Who killed Mandy and her family?” (23 Nov 2003)

https://www.theguardian.com/uk/2003/nov/23/ukcrime 

City Journal - Murder Most Foul

https://www.city-journal.org/article/murder-most-foul 

Documentary - The Clydach Murders: Beyond Reasonable Doubt - BBC Wales Investigates 2020

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