
Professional Technical Surveillance & Security Services – UK Wide
Discreet, lawful, and expert surveillance operations, training and equipment — trusted by corporate, government and private clients.

Operations
SIASS delivers lawful, discreet, and intelligence-led operational services across the UK. We support clients with a full range of technical surveillance, covert surveillance, and investigative operations, tailored to meet both operational and legal requirements.
Our services are designed to support corporate investigations, private investigations, and public-sector enforcement activity, providing clear, defensible evidence and actionable intelligence.
Technical Surveillance Countermeasures Inspections
SIASS conducts professional TSCM inspections to identify, assess, and mitigate the risk of hostile or unauthorised surveillance. These inspections help organisations protect sensitive information, people, and assets.
Covert Surveillance Operations
We plan and deliver covert surveillance operations to support investigations requiring discretion, accuracy, and evidential integrity. Operations are conducted lawfully and proportionately, with a strong focus on compliance and risk management.
Technical Surveillance Operations
SIASS provides specialist technical surveillance operations, including the deployment of lawful surveillance equipment to support intelligence gathering and evidence collection.
Due Diligence Reports
Our due diligence investigations provide detailed insight to support informed decision-making for organisations and individuals. These reports are commonly used in corporate investigations, safeguarding decisions, and risk assessments.
Family & Vulnerable Safeguarding Checks
SIASS undertakes family and vulnerable person safeguarding concern checks to help identify risk, support protective decision-making, and provide evidence where concerns exist.
Read our blog: Safeguarding Investigations
Fly-Tipping Investigations
We support councils, RSLs, and landowners with fly-tipping investigations, using covert and technical surveillance techniques to identify offenders and gather evidential material suitable for enforcement action.
Read our blog: Fly-Tipping Investigations
Anti-Social Behaviour (ASB) Investigations
SIASS assists with ASB investigations, helping organisations gather intelligence and evidence to address persistent or serious anti-social behaviour issues
Read our blog: ASB Investigations
Flexible Operational Support
SIASS can:
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Undertake full end-to-end operations, from planning to reporting
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Support organisations running their own operations, providing specialist advice, training, and operational assistance
This flexible approach allows clients to maintain control while benefiting from our expertise, experience, and resources.
Equipment Provision & Operational Support
To reduce costs and barriers to entry, SIASS can provide relevant surveillance equipment to support organisations and legitimate agencies, including:
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Local authorities
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Councils
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Registered Social Landlords (RSLs)
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Corporate security teams
This enables organisations to conduct lawful surveillance activity without the need to invest in expensive technical surveillance equipment, while remaining compliant and operationally effective.
Lawful, Ethical & Evidence-Focused
All SIASS operations are conducted:
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Lawfully and proportionately
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In line with UK legislation and best practice
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With a strong focus on evidence handling and reporting
Our approach ensures that outcomes are defensible, professional, and suitable for enforcement or legal proceedings.
Speak to Us About Operational Support
If you require support with technical surveillance, covert surveillance, or specialist investigation operations, SIASS can provide expert guidance and operational delivery.
Contact us today to discuss how we can run an operation on your behalf or support your organisation to deliver it effectively.