By Marcus Dysch, March 22, 2012
In a campaign dominated by two candidates so well-known that they are immediately recognisable by their first names alone, it is a new face in London politics which appears to have caught attention.
Independent candidate Siobhan Benita has walked away from a 15-year career as a senior civil servant to take on Boris and Ken and run to be Mayor of London.
She has the backing of former cabinet
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