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The building control officers, and your architect, will be referring to BS5839-6 when looking at the specification, the design guidance will be in there.
On reflection they're probably asking for a Grade D (mains) LD1 system. This is common enough for small loft conversions in lieu of creating a protected stairwell using fire doors. That's alarms in all circulation spaces and any rooms where a fire might start, so basically everything except your bathroom.
Vanneau
Yes, it's a loft conversion I'm having done but it appears that the rest of the flat, which isn't having any work done, will have to comply in terms of fire protection which my architect suggests means either new doors or lots of smoke alarms but pinning down an exact answer is a challenge.