I would not expect a landlord to supply anything like this in normal residential accomodation. We have a high risk community fire safety team who fit such things as "deaf alarms" free of charge in certain circumstances, purely to protect the resident, not to assist the landlord in any of his duties under any other act.
The place being a single private dwelling exempts it from the RRO, and while I am sure there are standards to be adhered to under the housing act I would not expect that it would cover anything over basic smoke detection. (if it includes any provision at all) Anyone living in a single private dwelling, rented or owned, would probably have access to a home fire safety check free of charge, and I would imagine other brigades will also have high risk teams that could deal with such specific things.
