@Alexandra199 @Mike-And-Jane0 Wales own documentation is virtually identical to England's in its wording, although in some ways parts of its layout might be more understandable? so for the link to their page, re "Fire safety responsibilities under Section 156 of the Building Safety Act 2022: guidance", it is;-
(www.gov.wales/fire-safety-responsibilities-under-section-156-building-safety-act-2022-guidance-html)
Both England's and Wales' sites' include their own versions of "Documents on fire safety law and guidance for those who have a legal duty for fire safety in a relevant building to help them meet those duties", the relevant sections, I would suggest, for the majority of Self Catering Accommodation Hosts (but NOT those who Host within a block of flats, as the Regulations, etc are different for them) - the following are probably the most relevant (although for the delegated "Relevant Person of Responsibility" I would respectfully suggest that each and every part of the said Regulations are checked to make certain nothing is "hidden" in other topics (e.g. You might think that the section relating to Guests with Disabilities applies to you, but "Disabilities" can also include those with non-visible ones (e.g. hearing loss, eyesight difficulties, rheumatoid arthritis, and many other health issues that might not allow Guests to move quickly or easily, hear alarms, see where to go, etc), so please take those into consideration as well.
On the England website, is a list (on the link provided in my previous reply) to what I would say are the most important elements to read, and then with which to comply, but as I also said, it would be best to read all, if only for your own peace of mind that you have covered all avenues.
The list - for England - includes (all Published 21 December 2022, and Last updated 4th October 2023) ;-
Contents
Legislative guidance (YES)
Fire risk assessment checklist (YES)
Guidance for evacuating disabled persons (YES)
Guidance for fire safety in small premises (YES)
Guidance for residential buildings under the Fire Safety Order (???)
Guidance for non-domestic premises (YES)
Guidance for livestock premises (???)
Guidance for workplaces where people sleep (YES)
Guidance for places of assembly (YES)
Fire safety law (YES)
Guidance (YES)
Legislative guidance
Check your fire safety responsibilities under Section 156 of the Building Safety Act 2022 (YES)
Fire Safety (England) Regulations 2022: fire doors (maybe?)
Fire Safety Act - addendum (???)
Check your fire safety responsibilities under the Fire Safety (England) Regulations 2022 (YES)
Fire Safety Order: enforcement and sanctions for non-compliance (YES)
Fire risk assessment checklist
Fire safety risk assessment: 5-step checklist (YES)
Guidance for evacuating disabled persons
Fire safety risk assessment: means of escape for disabled people (YES)
Guidance for fire safety in small premises
Making your small block of flats safe from fire (???)
Making your small paying guest accommodation safe from fire (YES)
Making your small non-domestic premises safe from fire (YES)
Guidance for residential buildings under the Fire Safety Order
Fire safety in purpose-built blocks of flats (???)
Guidance for non-domestic premises
Fire safety risk assessment: offices and shops (???)
Fire safety risk assessment: open-air events and venues (???)
Fire safety risk assessment: transport premises and facilities (???)
Fire safety risk assessment: factories and warehouses (???)
Fire safety risk assessment: theatres, cinemas and similar premises (???)
Fire safety risk assessment: educational premises (???)
Guidance for livestock premises
Fire safety risk assessment: animal premises and stables (???)
Guidance for workplaces where people sleep
Fire safety risk assessment: residential care premises (???)
Fire safety risk assessment: sleeping accommodation (YES)
Fire safety risk assessment: healthcare premises (???)
Guidance for places of assembly
Fire safety risk assessment: large places of assembly (maybe?)
Fire safety risk assessment: small and medium places of assembly (YES)
As to the comments about both Fire Doors and Smoke/Fire Alarms, hopefully the above will have better clarification as to exactly where they have to be installed, whilst as to the said Alarms, @Mike-And-Jane0 might I respectfully ask you to check whether it's just a case of having individually installed wired-in alarms/detectors in each room or on every floor level, or whether they have to be (as I've had to have installed in another property which is tenanted), linked-in-to-each-other alarms?
Finally, each County's or Area's Fire Department "should" have details of everything relating to what IS required, as opposed to those websites that suggest other items, so please do take care, and take all advice from only Official sites and documentation