Alarm Response and Key Holding in London

When an alarm activates at 2am, somebody has to attend. For businesses without a professional key holding arrangement in place, that call usually goes to a director, manager or member of staff, someone who has no way of knowing whether they're attending a false alarm or walking into an active break-in.

MSGUK Security provides professional alarm response and key holding services across London, putting trained SIA-licensed officers between your premises and that call. We attend, investigate, secure and report. Your staff stay home.

20-Minute Target Response Time

The Association of Chief Police Officers (ACPO) recommends that a primary key holder should be able to respond to an alarm activation within 20 minutes. That's the standard the industry works to, and it's the target we set for every attendance across our London coverage area.

When a call comes in, the nearest available officer is dispatched in a fully marked, high-visibility response vehicle. They stay in contact with our control room throughout the attendance. On arrival, they assess the situation, investigate the cause of the activation and take whatever action is needed to secure the premises.

Once the attendance is complete, you receive a detailed report covering findings, actions taken and any recommendations.

What Is a Key Holding Service?

A key holding service means a contracted security company holds a set of keys to your premises, stored securely off-site, ready to be used whenever an alarm activates or emergency access is required.

Rather than maintaining a list of internal key holders who may be unavailable, reluctant or put at risk by attending an unknown situation, you have a professional team on call around the clock. Keys are held under strict procedures, accessed only by authorised personnel and used solely for legitimate operational purposes.

It removes the need for multiple key holders across your organisation and ensures that whoever needs access to your building gets it quickly and safely, regardless of the time.

Why Use a Professional Key Holding Company?

Holding keys internally creates problems most businesses don't consider until something goes wrong. When an alarm activates in the middle of the night, there is no way of knowing in advance whether it's a sensor fault, a system error, a break-in in progress or something more serious.

Sending a member of staff or a director into that situation without training, backup or any way of knowing what they'll find is a significant risk. It also puts your organisation in a difficult position if something happens to them on site.

A professional alarm response company removes that exposure entirely. Trained officers attend, assess and handle whatever they find. If the police are needed, they liaise directly. If the premises need securing, they do it. The only contact you receive is a report once it's resolved.

How the Service Works

The process is designed to be straightforward from your side:

1. Your alarm activates and the alarm receiving centre contacts our control room.
2. A trained response officer is dispatched to your premises.
3. The officer attends, investigates the cause and takes appropriate action.
4. If required, they liaise with emergency services, site contacts or property managers.
5. The premises are secured before the officer leaves.
6. A full incident report is provided following the attendance.

What Happens When Officers Attend

Every activation is treated as a potential incident until proven otherwise. On arrival, officers carry out a thorough check of the premises, working through the following:

• External and internal checks: a systematic inspection of the building's perimeter and accessible interior areas.
• Investigation of the activation cause: identifying whether the alarm was triggered by an intruder, a fault, vandalism or environmental factors.
• Signs of forced entry or criminal activity: checking doors, windows, access points and securing anything that has been compromised.
• Liaison with emergency services: contacting police or other services directly where the situation requires it.
• Securing the premises: ensuring the building is properly secured before leaving, regardless of what was found.
• Incident report: a detailed record of attendance times, findings, actions taken and any recommendations for follow-up.

Trained Response Officers

All alarm response officers hold a valid SIA licence and have completed professional training through our in-house training centre before deployment. Officers operate in fully marked, high-visibility patrol vehicles and maintain contact with our control room throughout every attendance. Many hold additional qualifications including:

• Emergency First Aid at Work: enabling officers to assist anyone injured or taken ill on site while waiting for emergency services.
• ACT Awareness (Action Counters Terrorism): equipping officers to identify suspicious activity and respond appropriately.
• Fire Safety Awareness: ensuring officers understand fire risks and how to respond if a fire is discovered during an attendance.
• Health and Safety: covering officer responsibilities across different site types and environments.
• Conflict Management: training officers to handle confrontational situations calmly and professionally.
• Incident Reporting: ensuring every attendance is documented accurately for client records.

Dog Handler Support

Where a situation indicates heightened risk or a larger site requires additional support, security dog handlers can be deployed alongside response officers. This is particularly effective for:

• Industrial sites and construction sites with large perimeters
• Vacant properties with a history of intrusion or theft
• Large estates where a single officer attendance may be insufficient
• High-risk activations where an enhanced deterrent is needed

Reporting and Accountability

Following every attendance, a detailed report is produced covering the time of activation, attendance times, findings on arrival, actions taken, any security issues identified and recommendations where appropriate. This gives clients a complete audit trail of every incident and the steps taken to resolve it.

Combining Alarm Response With Other Services

Alarm response and key holding works well alongside other cover depending on your site:

• SIA security guards for sites that need a permanent on-site presence during opening hours alongside out-of-hours response cover.
• Mobile response teams for residential developments where resident-reported incidents need the same rapid attendance as alarm activations.
• Neighbourhood wardens for managed estates needing daytime community cover alongside overnight alarm response.
• Waking watch for buildings with fire safety remediation requirements needing continuous monitoring rather than response-only cover.
• Dog handlers for high-risk sites where an enhanced response capability is needed alongside standard alarm attendance.

One contract, one point of contact, whatever the site needs.

Common Questions

What is the difference between alarm response and key holding?

Key holding is the secure storage of your property keys by a contracted security company. Alarm response is the service that puts those keys to use: when your alarm activates, a trained officer uses the keys to attend, investigate and secure your premises. The two services work together and are typically provided as a combined package.

What if the alarm is a false activation?

False activations are common and treated with the same level of professionalism as confirmed incidents. The officer attends, carries out a full check, confirms there is no breach and secures the premises. You receive a report either way.

Will you liaise with the police if needed?

Yes. If the officer discovers signs of forced entry, criminal activity or any situation requiring police attendance, they liaise directly with emergency services on site. You are notified of the outcome once the situation is resolved.

How are my keys stored?

Keys are held securely off-site under strict management procedures. They are only accessed by authorised personnel for legitimate operational purposes and are never labelled in a way that connects them to your premises if lost or stolen.

Can this service be combined with static guarding?

Yes. Many clients use SIA security guards during operating hours and alarm response for out-of-hours cover, giving them professional security across the full 24-hour period without the cost of permanent overnight staffing.

Talk to Us About Your Site

Tell us what you're dealing with, the property, the hours, the history and we'll come back with a setup that fits it.