Domestic smoke detection, some have internal surge protection built into the units i.e. Aico heads have a standard that specifies units are to be tested with fast transient bursts of +/-2kV, and slow high energy surges of +/-0.5kV and 1kV. Would this be sufficient to negate the application of a separate SPD to be fitted within a consumer unit to meet BS7671 2018 AM2 2022 443.4.1?