It was exactly 25 years ago today when young estate agent Suzy Lamplugh disappeared while she was showing an unknown client around an empty property.

She has not been seen since July 28, 1986, and although her body was never found she has subsequently been declared dead.

Police launched a painstaking investigation but have never had strong enough evidence to prosecute anyone in relation to her death.

Suzy's legacy has led to an enormous amount of good work being done to help people with a range of issues, including aggression, violence and safety at work.

Her parents Diana and Paul Lamplugh did their best to turn the tragedy around and launched the Suzy Lamplugh Trust, which highlights risks and offers practical advice and support.

Mr and Mrs Lamplugh, who have both been awarded OBEs for their work, believed their 25-year-old daughter, of Disraeli Road, Putney, was simply unaware of the dangers people can face.

Suzy vanished after meeting a mystery client called Mr Kipper, who she was showing a house to in Fulham.

After the appointment, she failed to return to her office or home and was officially declared dead in 1994.

Police have followed hundreds of leads since she vanished and re-opened the case in 2000.

Then, a tip-off in August last year led to new hope of finally finding her body.

Detectives re-opened the search after a witness, who was a teenager at the time of the disappearance, said he remembered discovering a mound of earth at Norton's disused army barracks around the time she went missing.

Officers began excavating a field in Worcestershire where they believed she could be buried, but it came to nothing.

Mr Lamplugh told the Richmond and Twickenham Times he was "always hoping" to learn what happened to his daughter - but had to remain realistic about the chances after so long without answers.

The trust plans to commemorate Suzy throughout its 25th anniversary year, as well as celebrate its achievements.

Mr Lamplugh said: "For many years, Diana, strongly supported by trustees and incredibly dedicated staff, was the principal inspiration for and the drive behind the trust's work and I am enormously proud of what she and the trust has achieved.

"I'm delighted that the trust is still continuing its important work for the safety of everyone both out and about and in the workplace - particularly the life skill work for young people and indeed for elderly people and those with disabilities.

"Suzy lived life to the full; not long before she disappeared, she exclaimed to Diana: "life is for living, mum...".

"This concept underlies our work: we have a very positive approach to personal safety; we believe that people should live life to the full - but should do so safely."

The trust has created a range of new resources, including alarms, training manuals, booklets, DVDs and free safety leaflets to raise awareness of personal safety issues and give people practical help.

It has delivered workplace training across all sectors - to 36,000 people in 2008 alone.

And it also set up the national stalking helpline last year, which is supported by the Home Office, and established a national personal safety day in 1998. More than 230 police teams, councils, neighbourhood watch groups, schools and colleges held events around the country in 2010.

Catherine Skinner, director of the Suzy Lamplugh Trust, said: "When the trust was set up by Suzy's parents in 1986, only months after she had disappeared, no-one dreamt that it would still exist 25 years on, let alone have grown into such a vital, influential organisation. Everyone involved with the trust is proud of its past and excited about its future.

"The trust is Suzy's legacy to the country and it has benefited many hundreds of thousands of people during the last quarter of a century. We look forward to celebrating our 25th anniversary and to the next 25 years."

For more information, visit www.suzylamplugh.org.