ok, fair point. sort of. it must be compliant otherwise they wouldn't sell it as a compliant product - even if that compliance is self-certed.. if their self-cert is not accurate or true then surely the other signalling firms would kick up a fuss?
regardless of the comms the fundamental system needs to be reliable and the only way to achieve that is to install to a high standard a cabled system. that audible only system will do the job for which most end users want it to do. those who don't require any comms for insurance can be up-sold to key holder using a product which does not cause us headaches and makes us money.
in all honesty i'd rather be doing something which actually held some interest. i'm on a slippery slope at the moment of really starting to detest our industry and even resent the fact i'm stuck in it.