Shahidul Ahmed, 41, was given a life sentence with a minimum term of 17 years at Luton Crown Court for the murder of 19-year-old Rachel Manning, whose boyfriend Barri White was wrongly convicted of the killing.
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The unexploded bomb was found near the Houses of Parliament and led to disruption in central London overnight.
Southern parts of England and Wales will see sunny skies after a frosty start.
Police said the incident in Melbourne, Australia, was terror related.