The Harlow MP Robert Halfon was praised by the Chancellor George Osborne for campaigning for a measure in the Budget to scrap the fuel duty rise scheduled for September.
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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.