Choosing the wrong security company in London can leave your business dangerously exposed. With hundreds of providers operating across the capital, knowing what to look for – and what to avoid – is essential. This guide walks you through every factor you need to consider before signing any security contract.
Whether you need a single security officer for a small retail shop or a full security team for a large corporate campus, the selection process should never be rushed. A professional security company with SIA-licensed officers brings expertise, accountability and peace of mind. The wrong choice can cost you far more than just money.
Why Choosing the Right Company Matters
Security is not a commodity. The quality of your security provider directly affects the safety of your staff, customers, premises and assets. A poorly vetted company may deploy untrained or unlicensed officers who create more risk than they resolve. Under the Private Security Industry Act 2001, it is a criminal offence to deploy an unlicensed security officer – and that responsibility extends to the employer engaging the company.
With over 500 SIA-licensed officers on our books, GM Secure has helped hundreds of London businesses find the right security solution. Here is everything you need to know before making your decision.
The 8 Essential Factors to Check Before You Sign
SIA Licensing – The Non-Negotiable
What to check
Every security officer deployed in the UK must hold a valid SIA (Security Industry Authority) licence under the Private Security Industry Act 2001. This is a legal requirement – not optional. Ask any company to provide SIA licence numbers for every officer they intend to deploy. You can verify licences directly at sia.homeoffice.gov.uk.
Why it matters
Deploying an unlicensed security officer is a criminal offence under UK law. If a company cannot immediately confirm valid SIA licensing for all staff, walk away. Every GM Secure officer holds a current, valid SIA licence with no exceptions.
Professional Standards & Proven Track Record
What to check
Look for companies with a proven track record of delivering quality security services. Ask how long they have been in operation, whether they work with other security companies as trusted subcontractors, and what client testimonials they can provide. Many excellent security providers operate successfully without formal industry accreditations – what matters most is officer quality, vetting standards and consistent service delivery.
Why it matters
A company trusted to supply officers to other established security firms has demonstrated reliability in the most demanding way possible. Direct client feedback and references from similar businesses provide far stronger evidence of quality than certificates alone. GM Secure is already trusted by other security companies across London as a preferred B2B officer supply partner.
Staff Vetting – BS 7858 & DBS Checks
What to check
Ask specifically whether the company conducts thorough background checks on all staff in accordance with BS 7858:2019 (the British Standard for vetting security personnel), including identity verification, employment history review and Disclosure and Barring Service (DBS) checks. Request their vetting policy in writing before committing.
Why it matters
Improperly vetted officers pose a direct internal security risk to your business. BS 7858 compliance is widely regarded as the industry benchmark for security officer screening in the UK. Every GM Secure officer undergoes a full DBS check and vetting process before any deployment.
Training Standards & Sector Expertise
What to check
Beyond the SIA licence, ask what ongoing training officers receive. Do they hold First Aid at Work certificates? Are they trained in conflict management and de-escalation under the relevant SIA licence criteria? Do they have site-specific training for your sector – retail, construction, corporate or hospitality?
Why it matters
A door supervisor at a licensed venue needs different skills to a concierge officer at a corporate headquarters. Specialist training makes the difference between a professional response and an incident that escalates unnecessarily. Our officers hold relevant certifications for every sector we serve.
Want to See Our Credentials?
GM Secure is happy to provide full documentation – SIA licences, vetting policy, insurance certificates and references on request. No pressure, no obligation.
Request Our Company ProfileInsurance – Public Liability & Employers’ Liability
What to check
Any professional security company must hold Public Liability Insurance and Employers’ Liability Insurance. Under the Employers’ Liability (Compulsory Insurance) Act 1969, employers’ liability cover is a legal requirement. Ask for current certificates of insurance before signing any contract and verify the policy covers the specific services you require.
Why it matters
If an officer causes injury or property damage at your site and the company is uninsured, you could face significant financial and legal consequences. GM Secure carries comprehensive public liability and employers’ liability insurance on every deployment. Certificates are available on request.
Response Times & 24/7 Availability
What to check
Ask specifically: what is their emergency response time for your area of London? Can they deploy additional officers at short notice? What is their documented contingency plan if a scheduled officer cannot attend? Get these confirmed in writing within the contract – verbal assurances are not sufficient.
Why it matters
Security incidents do not follow office hours. A company that cannot be reached at 2am or cannot replace a no-show officer within hours leaves you exposed at the worst possible moment. GM Secure operates 24/7 with emergency deployment available across London and Essex.
References, Reviews & Companies House Check
What to check
Request at least two references from similar businesses in London – ideally from your sector. Check Google Reviews and verify the company’s details at Companies House (gov.uk) to confirm they are a properly registered, actively trading company. Check how long they have been incorporated and that there are no outstanding compliance issues.
Why it matters
A company’s past performance is your strongest predictor of future reliability. Any company reluctant to provide references or whose Companies House record raises concerns should be approached with caution. GM Secure is registered at Companies House (No. 15623450) and has a 5-star Google rating across 500+ completed deployments.
Contract Clarity & Transparent Pricing
What to check
Read every line of the contract before signing. Look for: minimum notice period to cancel, penalty clauses, how rate increases are handled, whether you are locked into a long-term agreement, and exactly which services are included in the quoted price. Be wary of quotes that seem unusually low – this almost always means corners are being cut.
Why it matters
Many businesses get locked into poor contracts with lengthy exit clauses. A transparent security company will explain every element of their agreement and offer reasonable flexibility. GM Secure provides clear, fully itemised quotes with no hidden charges and no pressure to sign.
Red Flags to Watch Out For
Avoid Any Company That…
- Cannot immediately produce SIA licence numbers for all officers – this is a legal requirement under UK law
- Quotes significantly below market rate – this signals unlicensed, untrained or under-insured staff
- Refuses to provide references from existing London clients
- Has no verifiable registered address or Companies House number
- Cannot provide current insurance certificates within 24 hours
- Pressures you to sign a long-term contract before completing a site assessment
- Cannot explain their BS 7858 vetting procedure in detail
- Has no dedicated point of contact or 24/7 emergency number
Your Pre-Contract Checklist
Before You Sign – Confirm All of These
- SIA licence numbers verified online for all proposed officers
- Company registered and in good standing at Companies House
- BS 7858 vetting policy provided in writing
- Current insurance certificates received and reviewed
- At least two client references contacted and verified
- Emergency response time and 24/7 cover confirmed in writing
- All contract terms read and understood – especially exit clauses
- Free site assessment completed before any contract is signed
- Named point of contact assigned to your account
- Pricing fully itemised with no vague line items
Questions to Ask Every Potential Provider
Use these questions in every conversation with a security company. How they answer tells you as much as what they answer:
- “Can I verify your officers’ SIA licences online right now?” – A confident, compliant company will say yes immediately.
- “What happens if an officer calls in sick on the day?” – They should have a clear, tested contingency plan.
- “Can you give me a reference from a similar London business?” – Hesitation here is a red flag.
- “What is your minimum contract period and notice to cancel?” – Know your exit options before you enter.
- “Do you supply security officers to other companies as a subcontractor?” – Companies trusted by other security firms have proven their reliability.
- “Who is my dedicated account manager?” – You should have a named individual, not a call centre queue.
- “Do you carry out unannounced quality checks on your deployed officers?” – Professional companies inspect their own work.
Why London Businesses Choose GM Secure
GM Secure Ltd was founded to bring a professional, transparent approach to security services in London. We are registered in England and Wales (Company No. 15623450), ICO registered (ZB687885), and operate with full compliance – every officer we deploy is individually SIA-licensed, DBS-checked, BS 7858 vetted and fully insured. We supply security officers to businesses across London and Essex, and to other security companies as a trusted B2B officer supply partner.
Our clients have a named account manager, direct emergency contact and 24/7 availability. Every client receives a free site assessment, a fully itemised quote and a service agreement with no hidden charges. We have a 5-star Google rating across 500+ completed deployments and are happy to provide references and documentation to any prospective client.
About GM Secure Ltd
GM Secure Ltd – Company No. 15623450, ICO Reg ZB687885, registered in England & Wales. Headquartered at Office 6429, 321-323 High Road, Chadwell Heath, Romford RM6 6AX. SIA-licensed, DBS-checked, fully insured security officers across London, Essex and the UK. Call 0794 782 2002 or email info@gmsecure.co.uk for a free, no-obligation quote.
Conclusion
Choosing the right security company in London requires proper due diligence – but it is worth every minute. The 8 factors covered in this guide – SIA licensing, professional standards, BS 7858 vetting, training, insurance, response capability, track record and contract clarity – form the foundation of any trustworthy security partnership.
Do not let price be your primary decision factor. The cheapest security option in London is almost always the most expensive in the long run. Invest in a professional provider who can demonstrate officer quality, client satisfaction and a genuine commitment to protecting your business.
Ready to work with a security company trusted by other security firms? Contact GM Secure today for your free site assessment and no-obligation quote.