He said one of the men chased him with a machete.
“It’s not every day you come to work expecting someone to come at you with a machete,” he said.
The man said he was told by a police officer that a moped was found abandoned in Islington, which he said is believed to be one of the mopeds used in the robbery.
The Metropolitan Police Twitter account for Westminster @MPSWestminster said that officers were called at around 10.32am on Tuesday.
A series of tweets read: “A number of males armed with weapons are reported to have driven to the premises on mopeds and smashed a window before stealing goods and fleeing.
“Officers attended, including specialist firearms colleagues.
“A man aged in his 30s has been treated by LAS for an eye injury sustained after the shop window was smashed.
“At this stage there have been no arrests.
“Anyone who has information that could assist police is asked to call 101 ref CAD 2222/28 May.”