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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A group of disabled activists threw toys and balls at him as he entered the conference.
A wet start to the week and the unsettled weather is set to continue over the next few days.
The Airports Commission backed a new runway in its final but the Chancellor appears to have set out a new timetable for the actual decision.