Protected Stairwells

I just need some clarification upon protecting stairwells in a hotel building using the example below. 

Building 4 Storeys. Age 1950's approx. 

Ground Floor - Bar and Restaurant 

First Floor - Guest Sleeping Accommodation

Second Floor - Guest Sleeping Accommodation

Third Floor - Guest Sleeping Accommodation

The building has 2 stairwells one from the third floor to a final exit on the ground floor and one from the second floor landing to ground floor via an alternative final exit. (Travel distances are within GM guidelines) 

Question 1 - I am sure all stairwells in sleeping accommodation should always be a fire resistant for a minimum of 30 minutes. Is this correct? if so are there any exceptions? what documents can help clarify this?

Question 2 - A follow up to this is would the same apply in an office building with no sleeping? 

Any response is appreciated.