Antony Hilson was killed by a driver who admitted playing with her sat nav for 18 seconds, not seeing him on his bike until it was too late.
Now speaking for the first time since her husband's death last September, Antony's widow wants the motorist banned from driving for life. She spoke to Divya Kohli.
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Rohey Hydara said that she "condemns" her husband's actions, almost a week after he killed four people.
The 300-year-old instrument, a Matteo Goffriller 1700 in a dark red case, was taken on Friday.
The London mayor's uncompromising message was delivered in a speech close to EU headquarters in Brussels.