Michael Ball and Imelda Staunton have won Olivier Awards for their performances in the musical Sweeney Todd.
Ball picked up the gong for Best Actor In A Musical while Staunton took the award for Best Actress In A Musical:
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David Lidington warned that Brussels institutions could be putting their own citizens at greater risk of attack.
A statement from the palace said the service is due to take place from 4pm and last around 40 minutes.