Is there anything in English Law, Building Regulations, best practice, etc. , which applies or recommends a limit on the number of independent locks, o r of independent locks which can only be opened with keys, or independent b olts or chains, or combinations thereof, or suchlike, on the entrance door of a flat?
It seems to me that too much security against unauthorised access may impos e an undue risk of being unable to escape rapidly in the case of, for examp le, fire.
URLs for authoritative relevant Web pages would be useful.