The distraught family of a mother-of-two who was brutally murdered in her car have shared their pain as her death remains unsolved 30 years on.

Denham mother Penny Bell, 43, was found slumped and covered in blood in her pale blue Jaguar XJS in the car park of the Gurnell Grove Swimming Pool in Greenford, London, on Thursday, June 6, 1991.

She had been stabbed more than 50 times.

As the 30th anniversary of her death approaches, Penny's daughter Lauren Bell has spoken out about their pain at not knowing who murdered her mother.

The case was revisited on BBC One's Crimewatch Live on Wednesday, March 10.

Lauren said: "We are grateful for the work of the Metropolitan Police and their determination to help solve this case.

"Thirty years marks an extremely painful milestone but with the help of Crimewatch and their viewers, we could be one step away from finding the perpetrator who still walks among us.

"Any information would be life-changing for us as a family and a result would mean we could finally find closure."

In January, 2019, a new witness contacted the police to report that they believe on the day Penny was killed they saw a man in his underwear who appeared wet, as if he had just washed, walking across the footbridge that crosses the A40 Western Avenue, Greenford.

The witness said it was around 10.50am to 10.55am that she saw him and described him as a bronzed/tanned male, tall, with short brown hair which was lighter on top and aged in his early 30s.

She added that he was wearing blue stripped boxer shorts, a white t-shirt, had a chunky chain link thick bracelet and was carrying a rucksack.

Detective Sergeant Susan Stansfield, from the Met's Special Casework Investigation Team, has urged anyone who may have seen anything similar to come forward.

Talking about this latest piece of information, DS Stansfield said: "Following some previous media coverage, a new witness has come forward with what I would call very significant information that might help us catch Penny's killer.

"She didn't see any of the media coverage or reporting at the time and has now put two and two together and spoken to a member of my team.

"Did you also see something odd at the time that you now might think is connected?

"Or did you also see this man in his underwear and think nothing of it? If so, we need to speak to you as soon as possible."

In the months leading up to Penny's death, extensive building work was being carried out at the house she lived at in Denham, with her husband and two children - with builders and decorators entering and leaving the property.

It was said that Penny kept a meticulous record of the spending on the building work. On

Days before her death, on Monday, June 3, 1991, at around 2.30pm, Penny went to her bank in Kilburn High Road and withdrew £8,500 in cash from her joint personal account.

The money was paid to Penny in used £50 notes and handed to her wrapped in a brown manila envelope.

Penny, apparently, made no mention of this withdrawal to anyone nor did she refer to it in her financial notes.

To this day, that money has never been accounted for and no one knows why she withdrew it.

A few days later, on the morning of Thursday, June 6, 1991, everything appeared normal at home.

About 9.30am, Penny made coffee for the builders. According to one of the builders, she appeared to be in more of a hurry than usual.

During this conversation Penny said that she had an appointment at 09.50am that she couldn’t miss.

Penny left at 9.40am in her Jaguar XJS and that was the last positive sighting of her.

At around midday, police were called to Gurnell Grove Swimming Pool in Greenford to reports of a woman slumped in the driver's seat of her car, covered in blood.

Officers and paramedics from London Ambulance Service attended but she was pronounced dead at the scene.

The female witnesses who called the police recounted that they had arrived at about 11.05am and parked next to Penny's Jaguar.

Both women saw one person in the driver’s seat of the Jaguar slumped over onto the passenger seat as if asleep, but noticed nothing else unusual and went swimming.

They returned to their car just after midday and the Jaguar was still there.

One women thought this odd and called over to the other. Upon closer examination, they saw the blood in the car and a wound on Penny’s arm.

When Penny was found she had been slumped across the passenger seat. Her grey handbag was open and placed behind the front passenger seat and still contained all of Penny's personal belongings with nothing, apparently, having been stolen and no signs that anyone had rummaged through the contents.

On the centre console of the car, and under Penny's body, was a wallpaper sample. Officers believe that prior to the attack the wallpaper sample was open across the centre console as if she were looking at it or showing it to someone.

A post-mortem revealed that Penny had suffered over 50 stab wounds.

DS Stansfield, adds: "It was a clear and sunny day on the morning that Penny was killed and it's estimated that around 300 people are believed to have used the car park or leisure facilities, meaning that there should have been plenty of witnesses who could help our investigation.

"Approximately 250 people who had used the leisure facilities between 9am and 11am were interviewed and eliminated.

"Over 60 drivers are known to have parked their cars in the car park during this time. No one interviewed had witnessed the attack or the killer's escape; it’s almost as if they vanished into thin air."

Following extensive media coverage at the time, a number of witnesses came forward to police.

A number of people came forward claiming to have seen a Jaguar car similar to Penny's in Greenford Road the morning of her death driving erratically.

Another witness contacted police to report a possible sighting of Penny at Black Park, Iver, on Thursday, June 6, at about 9.40am.

She describes how a woman fitting Penny's description, driving an identical car met with the driver of a bronze saloon car in Fulmer Common Road. She was sure from the subsequent publicity that it was Penny.

Another witness claimed that between 9.50am and 10am he also saw a pale blue Jaguar XJS parked in Fulmer Common Road.

To this day, the £8,500 Penny withdrew from the bank in the days before her death and who she had an appointment with on the day in question both remain unanswered.

The Met Police are hoping more people will come forward with information that could help solve Penny's murder.

There is a £20,000 reward for information that leads to the arrest and prosecution of the killer.

Information can be submitted via this link: https://mipp.police.uk/operation/0101020107B74-PO1 or call 0208 7858267.

It can also be provided to Crimestoppers, anonymously, by calling the independent charity on 0800 555 111.