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• The Ghost Immobiliser is not Thatcham-rated because Thatcham does not yet have a category that fits its technology, so it holds TASSA certification instead.
• TASSA is a respected, industry-recognised body that verifies and approves aftermarket security products and professional installers across the UK.
• Thatcham approval was designed around traditional Immobilisers and alarms, not silent, PIN-based CAN bus immobilisers like the Ghost.
• Many insurers accept TASSA certification as proof of a professionally fitted, credible anti-theft system.
• TASSA verification adds an extra layer of trust by confirming both the device and the installer, which matters just as much as the product itself.
The Ghost Immobiliser is not Thatcham-rated because Thatcham's current approval categories were built around traditional alarms and standard Immobilisers, and they do not yet cover the type of silent, PIN-based CAN bus immobiliser that the Ghost represents. Instead, the Ghost Immobiliser from Ghost Installations holds TASSA certification, a widely respected form of approval that verifies both the device and the professional who fits it. In this guide, we explain the difference between TASSA and Thatcham, why the distinction exists, and what it really means for your insurance and your vehicle security.
Before we compare them, it helps to know what each organisation actually does. Both play a role in vehicle security, but they approach it from very different angles.
Thatcham Research is a well-known name in the motor industry. It was established by insurers to research vehicle safety, repair, and security, and its rating system has long been used to classify car alarms and Immobilisers.
For years, Thatcham categories such as "Category 1" and "Category 2" were the benchmark for factory-fitted and approved aftermarket security. These categories were created in an era when alarms and traditional immobilisation systems were the main defence against theft.
TASSA stands for the Tracker and Aftermarket Security Systems Association. It is an industry body that verifies aftermarket security products, including advanced Immobilisers, trackers, and related devices.
Crucially, TASSA does not just approve the product. It also vets and registers the installers who fit these systems. That dual focus on both the device and the installation is one of the reasons TASSA has become so widely respected.
This is the question at the heart of the matter, and the answer is simpler than many people expect. The Ghost is not Thatcham-rated because it does not fit neatly into the categories Thatcham created.
Thatcham's traditional classifications were built around alarms and conventional Immobilisers. These systems typically rely on visible hardware, sirens, or separate fobs and tags.
The Ghost Immobiliser works in a completely different way. As a CAN bus immobiliser, it communicates silently with the vehicle's Controller Area Network and requires a unique button sequence before the engine will start. There is no siren, no extra fob, and no radio signal to broadcast.
Because this approach does not match the assumptions behind the older Thatcham categories, the device simply does not slot into them. This is not a sign of weakness. It reflects a genuinely newer generation of anti-theft system that existing frameworks were never designed to measure.
Traditional approval often focuses on how a system resists a physical or electronic attack in a set way. The Ghost instead removes the very thing a thief needs most: the ability to start and drive the car. Even after a relay attack unlocks the vehicle, the engine stays immobilised without the correct PIN sequence.
This preventive, PIN-based model is exactly the sort of modern solution that TASSA is well placed to assess. To see how this technology protects your specific vehicle, the team at Ghost Installations can walk you through how it works in practice.
It is easy to assume that one approval must be "better" than the other, but they are really doing different jobs. Understanding this helps you judge what matters for your own car.
• Thatcham has traditionally focused on classifying alarms and Immobilisers against established categories.
• TASSA focuses on verifying aftermarket security products and, importantly, the credentials of the installer.
One of TASSA's biggest strengths is that it looks beyond the device alone. A brilliant immobiliser fitted badly can still leave a car exposed, so verifying the installer is genuinely valuable.
TASSA-registered installers are vetted and accountable. When your Ghost Immobiliser is fitted by an approved installer, you gain confidence that the work has been carried out to a recognised standard, not just that the product is sound.
Because TASSA assesses a broad range of current aftermarket systems, it is well suited to newer solutions like CAN bus immobilisers. It reflects how vehicle theft and vehicle security have evolved, rather than relying solely on older definitions.
Insurance is usually the biggest concern for drivers weighing up TASSA against Thatcham, so let us address it clearly.
A common worry is that only Thatcham-rated devices carry weight with insurers. In reality, many insurers recognise and accept TASSA certification as evidence of a credible, professionally installed anti-theft system.
TASSA even provides documentation and verification that you can share with your insurer. This paper trail confirms that a genuine, approved device has been fitted by a registered installer, which is exactly the reassurance an insurer wants.
Whatever approval a device carries, you must always tell your insurer that it has been fitted. Declaring a quality immobiliser usually works in your favour, as insurers view advanced security as a positive step that reduces the risk of theft.
Before you commit, it is sensible to speak to your insurer and confirm how they treat TASSA-certified devices. Most will welcome the added protection, and some may offer better terms as a result. If you would like help understanding what to tell your insurer, the team at Ghost Installations can point you in the right direction.
Some drivers instinctively trust the Thatcham name simply because it is familiar. TASSA, however, has earned strong credibility in its own right, particularly around modern aftermarket security.
TASSA operates a verification scheme that confirms both the authenticity of the product and the legitimacy of the installer. This helps protect buyers from counterfeit devices and substandard fitting, two very real risks in the aftermarket world.
By registering and vetting installers, TASSA raises the standard of workmanship across the industry. For a device as sophisticated as a CAN bus immobiliser, correct installation is essential, so this focus genuinely matters.
TASSA recognition reflects the realities of modern theft, including relay attacks, key cloning, and OBD hacking. It is designed for the current generation of Immobilisers and security systems, which makes it especially relevant for a device like the Ghost.
In short, no. The absence of a Thatcham rating does not mean the Ghost is any less capable. It simply means the device belongs to a newer category of technology than the traditional Thatcham system was built to classify.
What truly protects your car is a combination of proven technology and expert installation, both of which TASSA verifies. The Ghost delivers powerful, preventive security by ensuring the engine will not start without your unique sequence, and TASSA certification confirms that this protection has been fitted properly.
For most owners, that combination offers exactly the reassurance they need: a credible standard, a verified installer, and a genuine defence against modern theft.
The reason the Ghost isn't Thatcham-rated is straightforward. Its silent, PIN-based CAN bus technology does not fit the older categories Thatcham created for traditional alarms and Immobilisers. Rather than being a drawback, this reflects just how far vehicle security has moved on. The Ghost instead holds TASSA certification, a respected standard that verifies both the device and the professional who installs it.
For insurance, TASSA is widely accepted as proof of a credible, professionally fitted anti-theft system, provided you always declare it to your insurer. With verified technology, an accountable installer, and protection designed for today's theft methods, you can feel completely confident in your choice. To secure your vehicle with a TASSA-certified, professionally fitted Ghost Immobiliser, book your Ghost Installations today and protect your car with total peace of mind.
