You are required to give name and address to Police when asked.
If there has been a fatality, or the posibility of a fatality or a fire the Police will have to complete a report for the Coroner - you do not have to offer any other details than name and address but expect a visit later on.
Some officers can be a little officious but if you are polite and as such pass the attitude test they will come around.
They are only doing a job.