I had a Toad Ai606 Thatcham Category I Alarm system fitted to mine some years ago.
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This links on to your existing central locking system to make it remotely operated, and has quite a few sensor options.
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I just went with
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ultrasonic interior protection and the usual links to anything being opened.
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It's been pretty reliable, and would probably go for another one again.
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If you want it professionally installed you need to shop around, but I'd expect to pay around
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£250 upwards these days.
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