Ed Miliband has set out a series of reforms designed to reshape Labour's relationship with the trade unions and end the "machine politics" behind the alleged ballot-rigging controversy in Falkirk.
In changes which could provoke a major clash with the union bosses who bankroll his party, Mr Miliband said he would reform the system of affiliating union members to Labour.
He also said he would introduce a code of conduct for would-be election candidates and introduce open primary elections for Labour's next candidate for London Mayor.
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Crossrail contractors have been hit with a fine of more than a million pounds over the death of a worker and other incidents.
Anh Nhu Nguyen, 52, claimed he lived in the North Kensington block and that his wife and son had died in the fire.
Roads will be closed in central London on Saturday 29 July and in London and Surrey on Sunday 30 July.