They also provided a colour photograph of a car identical to the red 1994 Triumph Acclaim used in the subsequent bomb attack on a Jewish charity office in Finchley, north London.
Police are appealing for information about the car or its registration, A49 UYK.
The woman, seen carrying a white Harrods shopping bag, is believed to have parked the other car bomb outside the Israeli embassy, which injured 13 people.
The suspect is described as thin-faced, Mediterranean looking, aged 55-60, with shoulder-length wavy brown hair. She was wearing large plastic-rimmed spectacles and a navy blue skirt and jacket.
Anyone with information should ring the Anti-Terrorist Squad on 0800 789321.
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