Barrister Kathryn Blair, 25, came face to face with the thieves as she and her boyfriend were walking their dog.
The two men, one armed with a gun, demanded cash and jewellery before suddenly fleeing empty-handed.
The former Prime Minister’s daughter and her partner were unhurt but were left in a state of shock.
Detectives believe the gunman also carried out an attempted street robbery on his own in the same area 30 minutes earlier.
Officers confirmed a firearm was produced on both occasions although no shots were fired.
Ms Blair and her boyfriend were threatened near her five-storey townhouse in Marylebone, central London, on Monday evening. » | John Twomey | Thursday, September 19, 2013
