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Thatcham Car Alarms Upgrade

Cat 1 Alarms Factory Upgrade

For these devices to become full Cat 1 alarms factory upgrade system a battery back-up siren is added and the system must be capable of anti-scan, anti-grab resistance of key codes while using the remote central locking and arming the vehicle. Sometimes extra features can also be added like wireless sensors or a PIR, however this depends on the vehicle and the relevant system.

In rare instances cars and vans may require a manufacturers turn-on by your local dealer for the system to work. This is because some vehicles require the ECU to have their factory alarm function enabled. This is not included in our pricing and Customers will need to arrange this through their local dealer after the alarm has been fitted. We can let you know at booking if this is necessary.

Thatcham Cat 1 Alarms

All of our factory upgrade devices are Cat 1 Alarms and this means they have been rigorously tested by Thatcham and are kept on this list by the manufacturer. This document can be seen (at end of page) and it is p37 for Autowatch 375 and p39 for Autowatch 695 and Clifford 2:1 upgrades. They are separated in the document as the second list is full digital CANBus systems and the first contains the analogue 375 upgrade.

Cat 1 status also depends on the system being fitted by an accredited installer. We are members of MESF and give a certificate with an impression stamp fit for insurance. We are also on the Thatcham recognised installer list (this is difficult to get and unusual for installation companies).

Mobile Car Alarm installation

We offer mobile car alarm installation Basingstoke, Guildford, Southampton, Worthing, Chichester, Midhurst to Lyndhurst areas. We will come to you

Customers who come direct to us will avoid paying finders fees charged by some companies. We have had customers stung for £100 and then given our phone number.

We are also very experienced and provide expert feed-back to alarm suppliers when installing products on new vehicles, this means that our fault-finding helps to update manufacturers technical databases.


We fit Thatcham car alarms Guildford, Southampton, Basingstoke, Chichester, Worthing, Midhurst and Lyndhurst. Mobile car alarm installation means we will come to your workplace or home.

Read more information on the Thatcham car alarms list of approved products for insurance compliance.