Yes it is. But like any system it's not infallible. The original HISS lost its Thatcham approval, not because it was crap but because it could be easily disabled with the correct parts. The HISS 2 that's fitted now is electrically identical but is better protected from tampering.
There is a retrofit available to convert HISS 1 to HISS 2 but for obvious reasons it's time consuming and expensive to fit.



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