The 1684 world map, cut from an atlas at the National Maritime Museum’s library, has not been found.
The Tory leader calls for more support for police officers and the public when they step in to help.
Energy secretary says she "didn't get it right" over comments she made about a TV interview.
Clifford Foster has been charged with the murder of Eleanor Barnfield, who died after police were called to a crash.
Ministers are set to gain powers over telecoms companies during national security emergencies.
He says he found treasure in his attic where the collection had been stored for 15 years.
