A similar case was reported by Tiff Needell (British Motoring Presenter/Hack) some months ago whilst he was leaving Sportmans Dinner in Mayfair. Some pond life tried to mug him and steel his watch. His young female (PA..evidently) fought off the muggers and they left empty handed.

: . . . further proof that nothing good happens on the streets
: after 2:00 AM.

: Jeff Press Association – Fri, Apr 20, 2012

: Police are searching for a gang of thieves who approached a
: stranger to shake his hand - before stealing his £100,000 watch
: from his wrist.

: The 40-year-old victim was approached by the group of three or four
: men in Berkeley Street, Mayfair, central London, at about 2.25am
: on Saturday, April 14, Scotland Yard said.

: The men, described as dark skinned Eastern Europeans aged in their
: mid 20s, shook the victim's hand before one of the suspects
: managed to remove the watch from his wrist and ran off towards
: Berkeley Square, Mayfair.

: The Breguet Tourbillon watch is one of only 60 in existence and has
: a rose gold rectangular face and a black crocodile skin strap,
: with the inscription 'Limited Edition 819AK' on the back.

: Police said no one had been arrested following the incident, which
: is being investigated by officers from the Westminster robbery
: squad.

:
: http://uk.news.yahoo.com/gang-snatch-100-000-wristwatch-183358887.html