Mayor Boris Johnson has promised to look again at Crossrail construction safety after a worker was electrocuted.
During the Olympic construction, a collective agreement on health and safety was put in place between the construction firms and the unions. The mayor was asked whether a similar agreement should be introduced for Crossrail.
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One of the teenagers was left so badly burnt doctors say he may lose his eyesight.
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Ryan Lee was removed from the finishers' list because he was not picked up by the 5k checkpoint.