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 volunteer on her campaign said to a voter that rival Sadiq Khan was a "liability" because he is Muslim.
A food historian has claimed that pasties made in Cornwall were mainly vegetarian - and the term 'Cornish pasty' was coined in London.
The demonstration is due to take place next Saturday in central London ahead of the "emergency" meeting in Brussels to discuss the crisis.