It is widely expected that Home Secretary Theresa May will make an announcement on an independent judge-led inquiry into the murder of Daniel Morgan.
The private investigator was found with an axe in his head in a London pub car park in 1987.
It has been claimed that police corruption prevented the murder from being solved despite six criminal investigations.
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The new addition to the family is the Queen’s seventh great-grandchild.
The artwork was destined for an American museum until Cambridge’s Fitzwilliam Museum raised more than £1m to buy it.
Police are investigating after the historic sword was taken from Canna House on the Isle of Canna, which has 18 residents.