Bulwark Consulting
- Specialising in services in the field of data and information governance policies.
- http://www.bulwarkconsulting.com

Yew Tree Services Ltd
- Provides services for information security, risk management, governance and auditing. Programs to achieve ISO27001, BS17799 compliance.
- http://www.yewtreeservices.co.uk

Turnkey Consulting
- Specialises in the implementation and review of SAP Security and Portals solutions as well as expertise in the implementation of the Governance, Risk and Compliance (GRC) product range.
- http://www.turnkeyconsulting.co.uk

SecuraNET
- Provides secure network solutions for small to medium sized organisations.
- http://www.securanetuk.com

Cat IT Security & Computer Consulting
- Buckinghamshire based technology consultancy specializing in security software implementation and management. Also offers training and network consultancy.
- http://www.cat-itsec.co.uk

NSS Group, The
- Security and certification consultancy services.
- http://www.nss.co.uk/

Mandalorian Security Services Ltd
- Providers of product-independent services including penetration testing, auditing, security architecture, product assurance and standards compliance.
- http://www.mandalorianss.com/

Context Information Security
- Offers a holistic approach to information security, independent advice and provides managed services where ongoing assistance is required.
- http://www.contextis.co.uk/

Red Kestrel Consulting
- Provides IT security consultancy and software development services.
- http://www.redkestrel.co.uk/

Armana Security Ltd
- Offering services on email management, firewalls, policy management, intrusion detection systems and BS7799 compliance.
- http://www.armana.co.uk

The Security Practice
- Offers services in threat management, forensics and electronic crime and ethical hacking.
- http://www.securitypractice.com

Trusted Management Ltd
- Specializes in operational risk management, BS7799 compliance reviews, policy and procedure development, security architecture development.
- http://www.trusted-management.com/

Trinity Security Services
- An independent security company specialising in providing security solutions to service provider and global enterprises. Headquartered in Reading, UK.
- http://trinitysecurity.com/

Securion Technology Ltd.
- An independent consultancy specialising in Network and Information Security solutions and services. Located in Swansea, Wales, UK
- http://www.securion.co.uk/

Securing Systems Limited
- General IT security consulting and risk mitigation.
- http://www.securingsystems.co.uk/

Worthy Associates
- Provides IT Security articles and advice to the IT community, as well as vulnerability assessments to governemetn and commercial interests.
- http://www.worthyassociates.com/

Vigilis
- Provides security audits, threat and vulnerability assessments, BS7799 and ISO17799 advice, policies development, penetration testing, incident response and business continuity plans, and security training.
- http://www.vigilis.co.uk/

Sec-1 Network Security
- Offers range of security consultancy services from managed firewalls to penetration testing.
- http://www.sec-1.com/

Positve Computer Solutions Ltd
- Offers security audits, risk assessments, VPNs, anti-viral and data recovery.
- http://www.pcsolutions.co.uk/

Portcullis Computer Security
- Information encryption and data security specialists. Providers of information security products and services.
- http://www.portcullis-security.com/

Pentest Security Assurance
- Performs security assessment and penetration testing services. Offers training in Oracle database security and penetration testing. Includes a collection of white papers and research links.
- http://www.pentest.co.uk/

Parkinson Howe Ltd
- Provides BS7799 information security, PKI and business continuity related management services.
- http://www.parkinsonhowe.co.uk/

Panoptech
- Provides secure network design, storage and consulting services.
- http://www.panoptech.co.uk/

iTrust Security
- Specializes in helping organizations reduce risk vulnerabilities and protect corporate assets whilst extending reach to field workers and corporate users.
- http://www.itrustsecurity.com/

IsecT Ltd.
- IT management consultancy specialising in information security, computer audit and other aspects of IT governance in the United Kingdom.
- http://www.isect.com/

ISEC
- A firm of security management consultants providing investigation, threat identification, loss prevention and crisis management services
- http://www.isec.net/

Interamic Network Security
- Specialising in small to medium sized companies and offering consultancy, installations, internet, penetration testing.
- http://www.interamic.co.uk/

Intellect Networks Ltd
- Security testing and auditing coupled with security policy writing and training.
- http://www.intellectnetworks.com/

Information Standards Limited
- Provides consultancy and cutomized evaluations for firms seeking security programs compliance.
- http://www.informationstandards.com/

Information Risk Management Plc
- Offer forensic investigation, penetration testing and security policy development services. Located in London, United Kingdom.
- http://www.irmplc.com/

FG Group Plc.
- Specialised security consultancy including system security, training services, specialist services, risk management and manned security.
- http://www.futureglobal.co.uk/

Echelon Consulting Ltd
- BS7799, IT security, and critical systems assurance.
- http://www.echelonltd.com/

dht associates
- Consultancy specialising in deployment of enterprise security including host based vulnerability assessments and intrusion detection.
- http://www.dhtassociates.co.uk/

Decus Ltd UK
- Offer a range of services, including security scans, penetration testing and internet security training.
- http://www.decusltd.com/

QCC Information Security Ltd
- Offers solutions for securing information, investigations including penetration testing, forensic analysis and bug sweeping.
- http://www.qcc.co.uk/

online-edge Ltd
- Provides network and Internet security counsulting and services in Scotland.
- http://www.online-edge.co.uk/

ObjectSecurity Ltd.
- Distributed systems security and building of integrated enterprise security solutions.
- http://www.objectsecurity.com/

mi2g Limited
- Digital risk consultants specialising in providing secure data visualisation. Also provide SIPS security intelligence briefings on hacker activity and various risk analysis tools. London, UK.
- http://www.mi2g.com/

Jules Birch Associates
- Offers independent consultancy and advice relating to I.T. security, disaster recovery planning and anti-virus systems.
- http://jba999.co.uk

jeksecurity
- Provide services advising on containing IT security risks including seminars, workshops, and on-site audits.
- http://www.jeksecurity.com/

Zylt Information Security
- Provides audits, rish assessments, policy and procedure development, compliance and related services.
- http://www.zylt.com/

StationX
- Provides a full range of security services as well as software resources. Located in the UK.
- http://www.stationx.net/

Oakridge IT Limited
- Offer network and internet security design and implementation services. Based in Bristol, United Kingdom.
- http://www.ibex-net.co.uk/

NoFools
- Experienced IT security advice and services. Located in the UK.
- http://www.nofools.co.uk/

Network Technology Solutions (UK) Ltd
- NTS offers network and internet security design, implementation services and security management. Based in London and Bradford.
- http://www.ntsuk.co.uk/

Network Secure Ltd
- Provide a range of security products and services including firewall management, security audits, risk assessment and system tests. Located in the United Kingdom.
- http://www.networksecure.co.uk/

Nemesys Computer Consultants Ltd
- Based in Cambridge, UK specialising in security policy development, risk analysis, information security reviews, security-critical software development and computer security incident handling.
- http://www.nemesys.com/

MIS Corporate Defence Solutions
- Offer configuration advisory, penetration testing and managed security services. Maidstone, Kent, United Kingdom.
- http://www.mis-cds.com/

Lighthouse Network Solutions
- Provides network and security consulting and services. Located in Irvine, Scotland.
- http://www.lighthousenetworks.co.uk/

I & P Consultants (Scotland) Ltd.
- Specialises in the delivery of network and server solutions.
- http://www.iandp.co.uk/

Gradian Systems
- Consultants specialising in user authenticity and session security.
- http://www.gradian.co.uk/

Global Secure Systems Ltd
- Provide a range of security products/services including firewalls, consultancy, authentication, wireless security, anti-virus and training. Located in the United Kingdom.
- http://www.gsec.co.uk/

Global Network Management
- Specialist IT networking and security consultancy offering a wide range of professional services and products.
- http://www.global-net.co.uk/

DNS Ltd
- Mobility solutions and managed security services. Edinburgh, Scotland.
- http://www.dns.co.uk/

Customroute Ltd
- A UK based firm providing services in the areas of secure architecture, design, and implementation.
- http://www.customroute.com/

Corsaire Limited
- Provides auditing, penetration testing, application testing and code reviews. Includes useful guides on security topics.
- http://www.corsaire.com/

Corporate Computer Consultants Ltd
- A management consultancy specialising in IT governance, e-commerce, information security, ISO17799, Sarbanes-Oxley audits, IP/IT/data protection audits, computer audits and IT strategy.
- http://www.cccl.net/

Control Risks Group
- Firm providing UK-based security consulting.
- http://www.crg.com/

Computer Crime Consultants
- UK company specialising in penetration testing, computer forensics, incident handling, intrusion detection systems, virtual private networks, firewalls and corporate fraud investigations.
- http://www.ccc-ltd.com/

commissum
- Provides a range of information security services to a broad cross-section of businesses and government organisations.
- http://www.commissum.com/

CIA Security Limited
- Provides security solutions to SME businesses in England's Thames Valley.
- http://www.ciasecuritysolutions.com/

Business Continuity and Risk Management Ltd.
- Specializes in management of the risks associated with their business including security audits, penetration testing, computer forensics, policy creation and management.
- http://www.bcrm.co.uk/

Blue River Systems
- Provides security services and risk assessment audits.
- http://www.blueriversystems.com/

Blue256 Ltd
- Offers network and internet security, installations and network support.
- http://www.blue256.co.uk/

Aston Information Security
- Offers services in the areas of information security, disaster recovery, business continuity and digital forensics.
- http://www.astoninfosec.co.uk/

Alert 247
- Offers on and off-site network testing and secure network architecture evaluations.
- http://www.alert247.net/

Alderbridge Consultancy Ltd
- Provides IT security consultancy services specialising in network security, firewalls, and vulnerability assessment.
- http://www.alderbridge.com/