Specialist Technical Surveillance & Investigative Support For 25 Years

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SIASS was founded in 2001 in Newcastle upon Tyne and originally operated as a traditional private investigation and close protection company serving Newcastle, Northumberland and the wider North East of England.

From the outset, SIASS established a reputation for professionalism, discretion and operational integrity. Founded by Gavin Saul, the organisation quickly became recognised for delivering lawful and ethical investigative services in sensitive and often high-risk environments.

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Over the past two decades, SIASS has evolved considerably. What began as a regional private investigation firm has developed into a specialist provider of covert technical surveillance support, professional witness operations and commercial Technical Surveillance Unit (TSU) capabilities throughout the United Kingdom.

Today, SIASS combines operational experience, specialist surveillance expertise and evidentially focused investigative practices to support organisations, professional investigators, legal teams and public-sector partners.

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Operational Experience Built Over More Than 2 Decades

Throughout its history, SIASS has supported a wide range of covert investigations and sensitive operational deployments.

Early work included:

• Close protection operations

• Employee fraud investigations

• Workplace theft investigations

• Surveillance operations

• Safeguarding-related investigations

• Professional witness evidence gathering

• Covert intelligence-led operations

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SIASS provided close protection services for Turkish dignitaries visiting Newcastle and also supported vulnerable private individuals involved in complex child custody and safeguarding matters.

The company subsequently undertook covert investigations into serious workplace theft and employee fraud on behalf of organisations requiring discreet, lawful and evidence-led investigative support.

These operations helped establish SIASS as a trusted and dependable investigative provider capable of operating within legally compliant and ethically robust frameworks.

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Professional Witness Operations & Community Safety Investigations

One of the defining areas of SIASS operational experience involved professional witness deployments supporting joint agency groups, social landlords and neighbourhood policing teams.

SIASS was approached to assist with a rising anti-social and criminal behaviour issue affecting a Liverpool community. The success of the initial covert professional witness operation led to repeated deployments gathering evidence in support of housing providers and community safety partnerships.

Professional witness operations require highly trained covert operatives capable of:

• Gathering admissible evidence

• Maintaining evidential continuity

• Operating discreetly in challenging environments

• Supporting lawful enforcement action

• Working alongside partner agencies

Over time, SIASS developed extensive experience supporting anti-social behaviour investigations, safeguarding operations and evidentially focused covert deployments.

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Supporting High Profile Investigations

SIASS has also contributed to several significant and complex investigations over the years.

The organisation acted as lead covert investigators in a major online defamation and harassment case which later reached the High Court of Justice in the United Kingdom. The case became widely recognised due to the scale of the defamatory online campaign and the substantial damages awarded.

Operations involving malicious communications, online harassment and reputational attacks require careful digital evidence gathering, covert investigative methodologies and a strong understanding of evidential standards.

SIASS has continued to support lawful investigations involving sensitive digital and behavioural evidence gathering where professionalism, discretion and evidential integrity are essential.

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The Evolution of SIASS

In 2024, SIASS strategically shifted its focus away from smaller-scale traditional private investigation services such as routine process serving and general enquiry work.

Instead, the organisation invested heavily in:

• Specialist covert surveillance operators

• Advanced technical surveillance equipment

• Covert operational capability

• Technical surveillance methodologies

• Specialist evidential capture systems

This transition enabled SIASS to develop into a specialist provider of covert technical surveillance support and private Technical Surveillance Unit (TSU) services.

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Commercial Technical Surveillance Unit (TSU) Services

Modern investigations increasingly require specialist technical capability.

SIASS now operates as a commercial Technical Surveillance Unit (TSU), providing lawful and ethical covert surveillance support across the UK.

This includes:

• Covert technical surveillance support

• Static and mobile surveillance operations

• Technical operational planning

• Evidential video and audio capture

• Surveillance consultancy

• Specialist covert deployment support

• Professional operational assistance

The organisation applies operational discipline, risk management and evidentially focused methodologies to every deployment.

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Partnership with Verrimus Ltd

As part of its continued development, SIASS works collaboratively with Verrimus Ltd to support the provision of commercial Technical Surveillance Counter Measures (TSCM) training within the UK.

TSCM — often referred to as electronic counter-surveillance or bug sweeping — involves the detection and mitigation of covert surveillance threats.

Through this partnership, SIASS aims to help improve awareness, training standards and operational capability within the commercial TSCM sector.

The collaboration combines practical operational experience with specialist technical expertise to support:

• Commercial TSCM training

• Counter-surveillance awareness

• Technical surveillance education

• Professional capability development

• Ethical operational standards

 

Ethical, Lawful & Professional Operations

Since 2001, SIASS has remained committed to conducting all operations lawfully, ethically and proportionately.

The organisation recognises the importance of:

• Privacy considerations

• Data protection compliance

• Evidential integrity

• Operational necessity

• Proportionality

• Risk management

Every operation undertaken by SIASS is approached with professionalism, discretion and a clear understanding of the responsibilities associated with covert surveillance and investigative activity.

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Looking Forward

The investigative and surveillance landscape continues to evolve rapidly.

Modern threats increasingly involve:

• Digital harassment

• Online abuse

• Technical surveillance threats

• Hidden recording devices

• Workplace criminality

• Complex safeguarding concerns

SIASS continues to adapt alongside these evolving challenges by investing in specialist capability, technical expertise and professional operational standards.

More than two decades after its foundation, SIASS remains committed to supporting lawful and ethical investigations whilst contributing positively to professional standards within the UK surveillance and TSCM sector.

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To discuss covert technical surveillance support, commercial TSU capability, professional witness operations or collaborative TSCM training opportunities, please contact us