The Gatwick Express is hoping to run a normal timetable between London Victoria and Gatwick Airport.
There are not engineering works due at the weekend but users are being warned that congestion on the motorways around London may lead to some delays as people try to visit the capital for the Jubilee pageant.
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Most of the region's MPs will support the Government's motion calling for air strikes in Syria, writes Political Correspondent Phil Hornby.
Tuesday afternoon's weather for the west of the region
Tuesday afternoon's weather for the east of the region