Leaseholder concerned about risk rating and fire alarm system being recommended

Hi. We live in a three storey house converted into three flats (on ground, first floor, attic) with one communal entrance way. The renovation was completed and signed off for regs in 2018.

The fire risk assessor has identified an evacuate policy and insist that the smoke alarms and call points (no control panel) in the small communal hall are not adequate and recommended a very expensive grade d ld3 system. They took no steps to understand the construction or check the flats, which all have smoke alarms plus fire suppression systems on the ground floor and top floor flats. This seems potentially unnecessary given the risk at play and will cost us an extortionate amount.

They have also recommended a test switch for emergency lights, door closers and rip out and fit a lockable fire proof box around the electrical cupboard. These seem less unreasonable, but we'd still like to understand if these are really essential as it all seems very disproportionate to a small risk.

Any guidance would be very helpful - I've looks at piles of regulations and bs standards etc and it seems to be the case that if you get an overzealous assessor they can force works on you that might not be necessary because it's all judgement based. Is my understanding right and is there anything we can do?