Becoming a holiday cottage carries a lot of responsibility.
This is a useful resource for those thinking of air b and b'ing homes:
https://www.sykescottages.co.uk/letyourcottage/advice/article/holiday-let-rules-regulations
Indemnity insurance
Smoke alarms
Carbon monoxide alarms
Furniture ONLY with fire safe labels
"While you will pay council tax for your home, if your holiday property in England was available to let for short periods totaling 140 days or more in the last year (20 weeks), and was actually let for 70 days or more, it qualifies for business rates rather than council tax."
You'll have to pay business rates for energy. I'm currently stuck on those as my rental used to be an Air B and B, and I've paid 24-40% more than domestic customers in the last year.
https://www.sykescottages.co.uk/letyourcottage/advice/article/holiday-let-fire-regulations-and-guidance
Annual gas safety inspections and a gas safety certificate are a legal requirement
Do I need to change my door locks from a key type to a thumb turn lock?
The law requires emergency doors not to be so locked or fastened that they cannot be easily and immediately opened by any person in an emergency. The guidance has expanded on this: “exit doors, such as the front or back door, should always be easy to unlock and must not need a key to unlock them from the inside.”
Ctrl + F 30-minute
https://assets.publishing.service.gov.uk/media/678a25129752f24aa1573571/Making_your_small_paying-guest-accommodation_safe_from_fire.pdf
In most instances, it should be possible to accept solid, conventional doors that are a good fit in their frames. This will typically comprise a 44mm thick door of solid timber or with a core comprising flaxboard or chipboard. However, hollow core and thin panel doors, and any plain (non-fire resisting) glazing within doors or frames, provide little fire resistance and will normally need to be replaced with new 30-minute fire-resisting doors.