Hundreds of people have staged a protest in Trafalgar Square against changes to the benefits system.
The so called bedroom tax, which is due to be introduced next month, would see welfare payments deducted from households judged to have extra rooms.
The changes mean that around 80,000 will lose an average of £771 each.
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A minute's silence is being observed at midday around Britain to remember the victims of the van attack near Finsbury Park Mosque last week.
Drivers of diesel cars are being hit with an extra £2.45 charge to park in parts of central London.
An inquest is due to open into the deaths of five friends who drowned during a day trip to Camber Sands in East Sussex last summer.