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If they are Exodus smokes on a Texecom Premier system I would consider a replacement for Aico low voltage. This is unless the site warrants a "proper" fire alarm system installing which maybe what the alarm company are alluding too. It's possible the devices are contaminated and need replacing, I'd expect them to be replaced periodically as part of maintenance if on brigade every 5 years. Also possible they are the wrong type of detection, the generic Exodus "blue" multisensor isn't suitable in kitchens and orangery's IMO. Beams are an option but they would have to be compatible with an intruder alarm, kit like fire beams are designed for a fire alarm as referenced above. TBH I would have at least made the system KH only and replaced the heads in the time being until you resolve the issue. Sounds like so far you have had people come and look but do little in reactive response. Either way your in the hands of the alarm company really.

All in one open plan space? As any type of smoke sensor is usually unsuitable for a kitchen anyway.