@Alexandra199 I estimate a £2000 cost for us.
Mains smoke alarms are easy as to fit as power is available at every ceiling rose. The required interconnection can be done by radio
Door locks - We have found a roller door lock which is like a Yale lock except it doesnt lock automatically when the door shuts.
Weekly checks are very simple - just such the smoke alarm button.
You haven't mentioned fire blankets or extinguishers
Our risk assessment is complete and we have a while in order to get all the locks/alarms fitted.
I don't see this as an attack on holiday lest but rather a recognition that guests should be as safe as possible in a strange environment.