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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Research into property prices has found London has more areas with an average price of more than £1m than anywhere else in the UK.
A permanent memorial will be unveiled today in memory of murdered Middleton soldier Lee Rigby.
The desk and chair where Charles Dickens sat to write his final novels have been bought for the nation using a national heritage grant.