These pictures of the London Eye cleaning were taken by a camera attached to a model helicopter. A team was using steam cleaning apparatus on the centre of the Eye.
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Firearms officer Martin Finney was awarded the George Medal, Britain's second highest civilian decoration.
Members of the RMT union who work on the Central Line will walk out at 9pm on Wednesday.
Southeastern was hit after a freight train derailed causing travel chaos for hundreds of thousands of passengers.