According to the Smoke Detectors Act : "1.-(1) A person who, in the course of a business carried on by him, constructs or arranges for the construction of a dwelling is guilty of an offence if the dwelling is not fitted with smoke detectors in accordance with the requirement mentioned in subsection (2) below. (2) The requirement referred to in subsection (1) above is that the dwelling is, before its construction is completed, fitted with one or more smoke detectors in such manner as to make adequate provision for the early detection of the outbreak of fire in the dwelling."
If you are convinced that the smoke detector does not make adequate provision as per the Bill, then it is likely that the landlord should be obliged to fit the detectors.
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