Immobilisers
A car immobiliser is the kind of protection you should consider if you are more worried about your whole car being stolen, rather than the contents or wheels. This concern is applicable from the cheapest of run-arounds to executive BMWs and Mercedes.
Some car alarms also include engine immobilisers. An electrical engine immobiliser is the most technical form of immobiliser and, while it does not offer a visual deterrent, it is still the most effective.
Wheel & Pedal Locks
Visual deterrents include pedal locks or steering wheel locks which are simple to fit, but hard to remove. This is a quick and easy solution which can also act as an additional line of defence, reinforcing a car alarm or other form of immobiliser.
If your vehicle does not have any of the precautions mentioned above, then another form of immobilisation, such as a wheel clamp may be required. These are ideal for caravans, trailers, horse boxes and any other vehicle that you don't use on a daily basis.