You can't even spell it.......
TenAbility. I rest my case.
(Just teasing!

)
It just seemed to be turning into a good old FSO bashing thread so I thought I would speak up.
I agree the guides should not be taken as minimum standards, but using them as a
benchmark standard is different. If you run some death trap of a building and I come and find you working away on the 4th floor with no protected stair, no AFD etc, then I will quite possibly give a solution straight from the guides. Protect the stair, get detection. I won't ask you for detection that is not required, and I won't ask for a fire door that is not required. I
may ask for an extra detector to compensate for a 25m dead end. But, why should I spend hours looking at other solutions at the tax payers expense when it is your responsiblity to comply in the first place?
If you want to submit an solution looking at ASET and RSET and backed up with a strategy/risk assessment etc then you submit it, and you should be so confident in your solution that you are prepared to defend it. If an FSO/FRS is being unreasonable then challenge them, appeal the notice. The appeal will at some point end up on the desk of someone who knows more about the subject, and if you are on the right lines then I am sure it will go no further.
I guess the main point I am trying to convey is; You cannot expect us to sit around doing smoke mass calcs, plume calcs, running CFD programs etc, just to save the RP a bit of money, we will go for the simple solution.