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What is a Thatcham Alarms Upgrade?

A Thatcham alarms upgrade is a factory upgrade system. It adds a battery back-up siren and interior sensors while still using your original factory supplied remotes. 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 manufacturer's 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.

Insurance Approved Car Alarms

All our upgrade systems are Insurance approved car alarms. There are some differences between the brands that mean different types are suited to different vehicles.

The Autowatch 695 is a robust and dependable product and is our best value upgrade alarm. It works on most vehicles using your original factory remotes.

The Clifford 2-1 upgrade comes in three types and again is suitable for most cars and vans. Here customers get the bright blue LED characteristic with all Clifford branded products.  

What is a Category 2-1: Alarm Upgrade?

A Category 2-1 alarm upgrade is a full alarm system. Your factory supplied Cat 2 immobiliser becomes a full Cat 1 alarm with interior sensors and a siren. Forr modern cars, many insurance companies ask for an alarm upgrade for vehicles to be insured against theft.

Thatcham approved Cat 1 alarm status also depends on the system being fitted to high standards with correct connections and adjustments made.  We are also members of MESF and give a certificate with an impression stamp fit for insurance.


Read more from the official Thatcham website for Thatcham alarms upgrade (search for Category 2-1: Alarm Upgrade in the second search field)

Read about our Autowatch Ghost 2 immobiliser.

View the Pandora Mini car alarm with 'must be present' tag to drive.


We are based in Faeham and are your local car alarm installer for Portsmouth, Havant, Chichester, Southampton, Winchester, Basingstoke, Lyndhurst, Brockenhurst, Hampshire, Emsworth, Bognor Regis, Littlehampton, Worthing, Lancing, Shoreham-by-Sea and West Sussex customers.