I live on the ground floor of a mid-terraced Victorian house which was converted into two flats (upstairs and downstairs) in 1992. I am in the process of selling my flat and the buyer’s solicitor has requested that I get a fire risk assessment completed for the communal hall. However, I am concerned that the assessment might recommend the installation of a hardwired linked alarm system between flats. I can’t see how this could possibly work as both flats have their own independent electricity supply paid for by the respective occupants and there is no single supply available to split between the respective landlords. Would I be exempt from implementing such a recommendation if it was made?

Not uncommon and it doesn't exempt from provision if the system is required. If the conversion was to building regs it might not need detection.