Scotland Yard said that a summons had been issued for Sun journalist Virginia Wheeler, from Kennington, south London, to appear at Westminster Magistrates' Court on February 11.
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Officials from the train drivers' union Aslef will meet managers from Southern Railway, whilst the RMT will meet separately with Acas.
Last week the organisation wrote on Twitter: "If Obama grants Manning clemency Assange will agree to US extradition".
The Foreign Office have changed their advice for UK travellers following political unrest in the west African country.