My Mk1 Supercharger conversion had an aftermarket alarm/immob fitted, but no documentation to prove it.
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Adrian Flux,
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(IIRC) asked for a
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"self-certification" of this, and were ok with that.
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It was a FlashPoint
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/ Laserline
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(IIRC), and I think was Cat 2 certified.
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Trouble is that Thatcham approval has changed over the last 2 decades, meaning that, in some cases, an alarm that may have been Cat1 in 1995 is no longer
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"approved" in 2010.
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!
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If you only have the alarm you say you have, I would strongly recommend getting one fitted professionally.
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If you had a better one already, then the self-certify would be a good route.
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After all, its only when some toe-rag has broken into your pride-and-joy that any of this will be relevant.
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.but you don't wanna get caught out, do you.
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?
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£120 for peace-of-mind is not too bad, IMHO.
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Better safe than sorry.
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!