Graham Tulloch
Drystone Lane, Nether Haddon, Gloucestershire, Cotswolds — autumn 2025
Case File Sealed
The solution to WW-2026-001 is classified. Opening this file is irreversible.
The Solution
The Killer: Caitlin Howell
Relationship: Personal assistant for four years. Daughter of Tulloch's late business partner, Derek Howell, who died in 2020.
Motive: Caitlin discovered proof in Tulloch's personal files that he deliberately defrauded her father out of his share of Tulloch-Howell Properties before dissolving the company. Her father died of a heart attack in 2020, which Caitlin attributes to the financial stress. She has been planning the murder since finding the documents eight months ago.
Method: Caitlin drove her silver Volkswagen Polo along Drystone Lane at approximately 6:20 p.m. on Friday 14th November, knowing Tulloch walked the lane every Friday evening between 6:00 and 7:00 p.m. She accelerated into him at the blind bend, struck him, and continued without stopping. She then drove to a car wash in Stow-on-the-Wold (15 minutes away) at 6:48 p.m. to clean any evidence from the vehicle, and returned home to Cheltenham.
Opportunity: Caitlin knew Tulloch's walking routine intimately, having worked as his PA for four years. She left the village on Friday afternoon ostensibly to drive home to Cheltenham but instead waited on a farm track off the B4068 until 6:15 p.m. before driving north along Drystone Lane. The lane is unlit and has no CCTV.
Chain of Evidence
- Step 1: The paint fragments on the victim's clothing are Volkswagen Group Reflex Silver (LA7W). Two vehicles connected to the investigation use this paint: Caitlin Howell's 2019 Volkswagen Polo and Marcus Poole's 2018 Skoda Fabia. Farrow's dark grey BMW is eliminated. Poole's white Land Rover is eliminated by colour and tyre size.
- Step 2: Forensic comparison of the two silver vehicles. Poole's Fabia shows no damage, no fibres, no cleaning residue. Howell's Polo shows a cracked fog lamp surround with a fibre, UV-visible cleaning chemical residue, and matching Continental EcoContact 6 tyre tread. The physical evidence favours the Polo but is not conclusive on its own.
- Step 3: Howell's witness statement says she saw Tulloch's porch light on at 'about half five.' The smart home log shows the porch light activates on a timer at 6:00 p.m. She could not have seen it before 6:00 p.m. She was in the village during the murder window, not driving home to Cheltenham as she claimed.
- Step 4: A car wash receipt from Stow-on-the-Wold at 6:48 p.m. places Howell cleaning her vehicle 28 minutes after the estimated time of impact. Stow is 15 minutes south of Drystone Lane. The timing is consistent with striking Tulloch at approximately 6:20 p.m. and driving south to the car wash.
Red Herrings Explained
Damage to Marcus Poole's Land Rover bumper
He reversed into the pub's gate post on Wednesday. The postman, Ray Gerrard, witnessed this and confirmed it. The paint transfer on the bumper is green, matching the gate post, not consistent with a pedestrian impact.
Poole's comment at the parish council: 'Someone ought to run that man off the road'
Pub landlord bluster at a public meeting about a planning dispute. The kind of thing said in frustration, not the language of someone planning a murder.
Diane Farrow's threatening text messages to Tulloch
She was pursuing the hidden assets through a solicitor and the courts. Her threat to 'make him pay' was about the legal claim, not physical violence. Her alibi is confirmed by phone location data and a Ring doorbell camera.
Diane Farrow's dark-coloured car and presence in the village
Her BMW was parked in Sophie's drive from 4:10 p.m. Friday to 9:45 a.m. Saturday, confirmed by a neighbour's doorbell camera. The paint on the victim's clothing is silver, not dark grey.
Poole's silver Skoda Fabia matching the VW Group paint code
The Fabia shares the same VW Group Reflex Silver (LA7W) paint and the same tyre size (185/65 R15). It was parked in the pub car park all Friday evening. Forensic examination found no damage, no fibres, no biological material, and no cleaning residue. The vehicle was not involved.
The Solution: Case WW-2026-001
Drystone Lane, Nether Haddon, 14th November 2025
Every Friday evening at six o'clock, Graham Tulloch put on his waxed jacket and flat cap, took his walking stick from the stand by the door, and walked south along Drystone Lane. Eight hundred metres to the B4068 and back. The same route, the same time, for years. Marcus Poole saw him pass the pub. The village set its clocks by him. It was as reliable as the church bell and a good deal less welcome.
On 14th November, someone used that routine to kill him.
The vehicle came from the south, travelling north along the lane towards the village. It accelerated into the blind bend at 40 to 50 mph. It struck Tulloch squarely, throwing him into the drainage ditch. It did not stop. It did not brake. The tyre marks on the road surface show only acceleration.
Let us consider who did not drive that vehicle.
Diane Farrow had the bitterest grievance. Eighteen years of marriage, a contested divorce, and 300,000 pounds in hidden assets. She sent a text threatening to make Tulloch pay. She was in the village that evening. She drives a dark-coloured car. On paper, she looks like a woman with nothing left to lose.
But her BMW never moved. The Ring doorbell camera at 3 Church Lane, directly opposite her daughter's cottage, recorded the BMW in Sophie's driveway from 4:10 p.m. on Friday to 9:45 a.m. on Saturday. Her phone placed her at the cottage continuously. Her car is dark grey, not silver, and the paint on the victim does not match. Diane's anger was real, but she was pursuing Tulloch through the courts. She needed him alive to face the claim. As she put it herself, his death has complicated matters, not simplified them. Sometimes the person with the sharpest tongue is the one holding the pen, not the steering wheel.
Marcus Poole had the loudest motive and the most visible evidence against him. He had publicly told a room full of people that "someone ought to run that man off the road." His Land Rover had a dented bumper. He admitted to stepping outside the pub at 6:15 p.m., right in the middle of the window. And he owns a second vehicle: a silver Skoda Fabia, VW Group, the same Reflex Silver paint code as the fragments on the victim's clothing. If you were assembling suspects in order of conspicuousness, Poole would be first in the queue and complaining about it.
But the Land Rover's bumper damage is from reversing into the pub's gate post on Wednesday. The postman witnessed the collision. The paint transfer on the bumper is green, from the gate post, not silver. The Land Rover is white, and its tyres are twice the width of the marks at the scene. That vehicle was not involved.
The Fabia, then. It matches the paint. It was parked in the pub car park all Friday evening. But the forensic examination found no damage, no fibres, no biological material, and no cleaning chemical residue. The vehicle appears untouched. And Poole's cigarette break lasted eight minutes. Two regulars saw him return to the bar at 6:23 p.m. The blind bend is 280 metres from the pub. To walk to the car park, start the Fabia, drive to the bend, strike a man, return, park, and walk back to the front door in eight minutes, without anyone hearing the engine or noticing his absence -- it is not impossible, but it is very tight. And if Poole had used the Fabia, the forensic evidence should show it. A vehicle that strikes a pedestrian at 40 to 50 mph does not come away clean.
Which leaves Caitlin Howell, whose silver Volkswagen Polo also carries VW Group Reflex Silver paint. The same code. The same colour.
The Evidence Chain
Step 1: The paint. The fragments embedded in Tulloch's jacket and trousers are Volkswagen Group Reflex Silver Metallic, colour code LA7W. This eliminates Farrow's dark grey BMW and Poole's white Land Rover. But it matches two vehicles: Caitlin Howell's 2019 Volkswagen Polo and Marcus Poole's 2018 Skoda Fabia. The paint alone does not identify the killer. It narrows the field to two silver cars.
Step 2: The vehicles. The Fabia shows nothing. No damage, no fibres, no cleaning residue. Howell's Polo, by contrast, has been recently washed. Under ultraviolet light, there is cleaning chemical residue on the front bumper and lower nearside wing, consistent with a commercial jet wash. The nearside fog lamp surround has a hairline crack, and a single fibre caught in the crack was recovered for comparison. The Polo's tyres are Continental EcoContact 6, size 185/65 R15, matching the scene tread marks in both size and pattern. The Fabia's tyres are a different brand, and the tread comparison with the degraded scene marks is inconclusive. The physical evidence points toward the Polo, but a cracked fog lamp and a recent wash are not proof of murder. People wash their cars. Fog lamps crack from road debris.
Step 3: The porch light. In her witness statement, Caitlin says: "As I drove past the house, I could see his porch light was on. It must have been about half five." But the smart home system log, confirmed by CSI Payne, shows the porch light is on a daily timer set to activate at 6:00 p.m. It has been set to this time since the system was installed in April 2023. At half past five on 14th November, the porch light was not on. Caitlin could only have seen it illuminated if she drove past The Old Rectory after 6:00 p.m. She was not leaving at half five. She was still in the village. During the murder window.
Step 4: The car wash. A receipt from the Cotswold Car Wash in Stow-on-the-Wold is timestamped 6:48 p.m. on 14th November. Payment by contactless card ending 4471, registered to C. Howell. Stow-on-the-Wold is approximately 15 minutes south of Drystone Lane via the B4068. If Caitlin struck Tulloch at approximately 6:20 p.m. and drove south, she would have reached the car wash at almost exactly the time the receipt shows. She was cleaning the evidence from her car.
Red Herrings Explained
Poole's bumper damage: From reversing into the pub's green-painted gate post on Wednesday. Witnessed by the postman. Green paint transfer on the bumper, not silver. The Land Rover's tyre size does not match the scene.
Poole's silver Skoda Fabia: The Fabia matches the paint code and was at the pub all evening. But the forensic examination found nothing -- no damage, no fibres, no cleaning residue. A vehicle that strikes a pedestrian at speed collects evidence. The Fabia did not because it was parked in the car park all night, untouched. Poole's eight-minute cigarette break is suggestive but too tight, and the physical evidence does not support his involvement.
Poole's public threat: Bluster at a parish council meeting, spoken in frustration in front of twelve witnesses. The language of a man venting about a planning dispute, not the careful planning of a premeditated killing. People who announce their intentions at public meetings are rarely the ones who follow through.
Farrow's threatening texts: She was pursuing the hidden assets through a solicitor. "Make him pay" meant through the courts. Her alibi is confirmed by phone data, her daughter, and a Ring doorbell camera that recorded her car stationary all evening.
Farrow's dark car and presence in the village: The paint on the victim is silver, not dark grey. The BMW did not move. Diane walked to the shop at 5:28 p.m. and returned at 5:41 p.m. She did not go near Drystone Lane.
The Key Inconsistency
"As I drove past the house, I could see his porch light was on. It must have been about half five."
Caitlin Howell's statement is the warmest, the saddest, and the most sympathetic of the three. She speaks of Tulloch with genuine affection. She describes her father's death without bitterness. She presents herself as a loyal assistant who was given a lifeline by a generous man. She mentions a note he left on the dashboard of a borrowed car. She remembers the mud on his boots. It is the kind of account that makes you want to look elsewhere for the killer.
But the porch light gives her away. The Hive smart home log is unambiguous: the light comes on at 6:00 p.m. every day, on a timer that has not been changed since 2023. At 5:30 p.m. in November, it is dark outside, which is why the detail feels plausible. It should have been dark enough for a porch light. But the light was not yet on.
Caitlin said "about half five" because she needed to have left the village before Tulloch set out on his walk at 6:05 p.m. If she was seen or placed in the village after six, she would have no explanation for being on Drystone Lane. So she moved her departure earlier. The porch light was a detail intended to anchor the time, to make the statement feel grounded and specific. Instead it proves she was lying.
She did drive past the house, and the porch light was on. But it was after six o'clock, not before. She saw the light because she had waited for it to come on, waited for Tulloch to leave, and then driven south to the B4068 before looping back up Drystone Lane to meet him at the bend.
Her phone was off from 5:35 p.m. to 7:20 p.m. Not a dead battery. A deliberate gap. Caitlin Howell knew exactly what she was doing and for how long she needed to be invisible.
Historical Note
Vehicular homicide staged as a road accident is one of the most difficult crimes to prosecute. In rural areas without CCTV or witnesses, the default assumption is always tragic accident: a pedestrian in dark clothing, an unlit lane, a driver who did not see them. Investigators must prove intent, which means proving the driver knew the victim would be there, chose to accelerate rather than brake, and took steps to conceal the evidence afterwards. The regularity of a victim's routine, which makes them vulnerable to such an attack, is also what makes the attack provable: if the killer knew the routine, they can be connected to the knowledge. In cases where the killer and victim are closely associated, the very intimacy that provided the opportunity also provides the trail.
Case WW-2026-001. The killer is Caitlin Howell.