The Labour London mayoral hopeful wants higher tax bands introduced by local councils.
We need a mayor who works to help Londoners with second jobs, not those with second homes.
By resisting a progressive measure backed by most Londoners, they have given Sadiq Khan the chance to position himself as the radical candidate.
Labour MPs and potential rival mayoral candidates David Lammy and Tessa Jowell are among those fighting for co-operative approaches to London's problems.
Shadow London minister will not follow David Lammy in launching mayoral bid before the election.
The dominance of the capital threatens to choke the life from the rest of the United Kingdom. We must act before it is too late
With Johnson departing, City Hall is the opposition's for the taking. But which contender will move first?
When it comes to tackling the real issues facing the city, Boris has failed spectacularly.
We must end the virtual monopoly that private developers have on building affordable homes.
On the day London tenants have earned enough to pay off their annual rental payments, it's time to talk about tenancy reform and building more homes.