Boris Johnson asked the Chancellor George Osborne "to look at the baleful effects of stamp duty" in London and elsewhere during his conference speech.
The Mayor of London told the Conservative Party conference: "It's called stamp duty for a reason, because it's stamping on the fingers of those who are trying to climb the property ladder.
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People travelling into the capital have been getting off a stop early to walk together in remembrance of the victims of the 7/7 bombings.