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Not that I am suggesting you do get sign off and forget about the install.
If I were running a job and the client asked me to "forget" installing something like this I'd ask for confirmation in writing for bottom covering purposes.
I'm no insurance expert but if there is a fire and the insurance company spots that BC signed off on a fire suppression system that ain't there I'd put money on them not paying out. At which point blame would shift to the project manager.
Didn't see this post.
Around ours, it appears to be common for building control to sign off on spec of mist systems, rather than the actual install.
Worth having a chat with people around you that have had conversions done.
(I may haver spent a few weeks just knocking on doors and being shown around complete strangers' houses.)
Not that I am suggesting you do get sign off and forget about the install.