Power workers on London Underground are threatening eight days of strikes in a long-running row over conditions. Members of three trade unions are set to walk out from 8pm next Tuesday until 8pm on Wednesday July 9.
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The operation carried out by Westminster City Council led to the seizure of £8,000 worth of cigarettes.
Armed troops have been stationed around Parliament to free up armed police to patrol the streets in the wake of the Manchester bomb attack.
Chelsea had planned an open top bus tour to show off the Premier League trophy and hope to add the FA Cup in Saturday's final with Arsenal.