The rehearsal kicked off from the National Space Center in Leicester just after 7am this morning, carried by Jasmine Vanmali, one of the local people selected as torch bearer.
The actual Olympic flame will pass through 1,018 places in the UK, as well as visiting Dublin, arriving in London for the Olympic Games opening ceremony on July 27.
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The operation to recover the unexploded bomb near the Houses of Parliament let to disruption in central London overnight.
Southern parts of England and Wales will see sunny skies after a frosty start.
A police spokesman said the incident in the Bourke Street Mall on Friday was not related to terrorism.