We provide a high-end, trustworthy, and discreet corporate surveillance service. Specialising in both physical and technical deployments in rural and urban locations.

Security Management

Bespoke Solutions Tailored for Client Needs

We pride ourselves on our ability to understand our clients needs, creating unique solutions for their problems.

Our surveillance and counter surveillance teams, deploy in support of civil & legal cases, workplace & corporate investigations, insider threat detection and as a surveillance identification team, both in the UK and overseas.

Our Train section details our counter surveillance and surveillance awareness training courses offered to executives and those at risk of hostile surveillance.

Protection from commercial espionage and insider threat.

Our clients include businesses of all sizes and their associated stakeholders, from a range of sectors. Typical projects include:

Identifying staff members who may be selling business intelligence and intellectual property.

  • Identifying electronic and physical surveillance against executives and project leaders.
  • Preventing planned theft and fraud against businesses.
  • Conducting due diligence against potential business partners.
  • Establishing secure venues for sensitive business meetings.

Experienced operators providing a high-level service

Our corporate surveillance projects require the sensitivity and experience gained by operators with established backgrounds in intelligence, law enforcement, and specific military units, most of whom have received high-level training not available to the commercial sector.

Our teams comprise of male and female corporate surveillance operators, hand-picked for each project and environment. Our surveillance professionals are highly experienced in obtaining photographic evidence, evidential procedures, and report writing.

Guildstone Associates is part of the Black Diamond Group and is able to draw upon the group’s comprehensive resources and experience to support the needs of our clients. Click here to view our Professional Security Services

Trustworthy and Discreet Service

We invest in our client relationships, building solid foundations of trust and discretion. Our professionalism ensures that our clients value our service and return to us for their business security needs.


Black Diamond is a trusted service provider within the industry who specialise in installing and managing superior security systems. Our services are delivered by highly trained security specialists with a depth of knowledge in providing solutions to the Corporate sector, ensuring your business is protected around the clock.

Our integrated approach enables us to provide,cover and support upon request to all aspects and phases of our clients’ operations:

  • Corporate Security
  • Hotel Services
  • Concierge/ Reception
  • Access Control
  • Event Security
  • Mobile Patrols
  • Airport Services
  • Close Protection
  • Technology Solutions
  • 24/7 Control