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WELCOME - What is? THATCHAM
Thatcham is...
A world-leading automotive crash repair research and technology centre that provides the automotive and motor insurance industries with valuable commercial information through research and development, consultancy, training and publishing services.
Thatcham's unique position between vehicle manufacturers and motor insurers accounts for a portfolio of research-based services and products that is unmatched globally.
Thatcham's work supports vehicle manufacturers, repairers, equipment manufacturers, and insurance assessors. This ensures motorists benefit from quality standards in vehicle repair, security and safety, and cost effective insurance claims.

The Thatcham Vehicle Security Categories
Category 1
Passenger Cars, LCV, HGV, Plant, Motorcycles
ELECTRONIC ALARM AND IMMOBILISER
- Alarm
Perimeter detection
Ignition detection
Passenger compartment movement detection
Inclination detection (Motorcycle only)
Audible warning with battery back-up power supply
- Immobiliser
Passively set
Isolates a minimum of two operating circuits or systems, or a minimum of one operationally relevant vehicle control unit with coded intervention
The Thatcham Vehicle Security Categories
Category 2
Passenger Cars, LCV, HGV, Plant, Motorcycles
ELECTRONIC/ELECTROMECHANICAL IMMOBILISER
- Immobiliser
Passively set
Isolates a minimum of two operating circuits or systems, or a minimum of one operationally relevant vehicle control unit with coded intervention
The Thatcham Vehicle Security Categories
Category 2-1
Passenger Cars, LCV, HGV, Plant, Motorcycles
ELECTRONIC ALARM UPGRADE [GENERAL APPLICATION]
- Alarm
Perimeter detection
Ignition detection
Passenger compartment movement detection
Inclination detection (Motorcycle only)
Audible warning with battery back-up power supply
Resistance to attack for a minimum of one minute
Installed on vehicles with existing Category 2 immobilisation to attain Category 1 status
The Thatcham Vehicle Security Categories
Category 3
Passenger Cars, LCV, HGV, Plant, Motorcycles
MECHANICAL IMMOBILISER
- Immobiliser
Easy to set and unset
Isolates a minimum of one operating system
Permanently or temporarily installed
The Thatcham Vehicle Security Categories
Category 4
Passenger Cars, LCV, HGV, Plant, Motorcycles
WHEEL LOCKING DEVICES
- Reliability and durability
- Secure key replacement procedure
- Product traceability
- Resistance to attack
Star Rating - In Vehicle Telemetry Systems
The table below shows differences offered by various telematic System types.
For high risk vehicles it is recommended that Category 5 systems be fitted.
All other systems offer benefits depending on application.
Contact Thatcham if further information is required
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- Mandatory Feature |
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- Optional feature |
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- Disallowed feature |
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Cat 5 |
Stolen Vehicle Tracking |
TQA Standards
Stolen Vehicle Location |
Fleet Management Secure |
Fleet Management Standard |
| Battery Back-Up |
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| Bi Directional communication |
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| Street level mapping |
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| Police or Licenced security agreement |
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| Positional data store |
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| Illegal Motion Detection (Ignition off theft alert) |
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| Driver Identification (Ignition on theft alert) |
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| Approved Secure Operating Centre |
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| Engine Crank Inhibition |
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| Level 1 Police response |
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Police Response to Stolen Vehicles "UK"
The police service has a public duty to prevent and detect crime and bring offenders to justice.
The Association of Chief Police Officers (ACPO) has produced a Policy on Police Response to Security Systems, which includes Vehicle Tracking Devices.
Where vehicle-tracking devices comply with the ACPO policy a Unique Reference Number (URN) can be allocated to the System Operating Centre (SOC).
This will allow the SOC on receipt of a crime number to report the unauthorised taking of motor vehicles to the police over dedicated lines, direct into police control rooms. It will also allow the SOC to give real time information on the movement and location of the vehicle and if requested, immobilise the vehicle. In return, systems that meet these requirements, will give the police confidence to allocate a priority response.
When a vehicle is stolen and does not have a tracking device or has one that does not meet the requirements of the ACPO policy the following will apply:
The level of police response will depend on the quality of information received.
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