Tom Tv i totally agree with you, NSI means practically nothing, My company isnt SSAIB or NSI but ive spent my employed career working for NSI companies, here i am 27 years on and i cannot justify the costs of the NSI, I take over many alarms installed by NSI companies are they are terrible, badly installed etc etc, No fused spurs, bell box tampers linked out, faulty door contacts programmed out where resistors have coroded and the so called engineer obviously couldnt find the problem, So im afraid people of Britian dont be fooled into thinking NSI companies are great, they are certainly not, What they will do is rip you off, and rip you off they do.
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Scantronic engineer, August 2011