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LONDON, ENGLAND - MAY 26: Garden workers in the GMB trade union who maintain gardens and central London parks, including the gardens of Downing Street, conduct strike action in a dispute over pay outside Downing Street in London, United Kingdom on May 26, 2015. (Photo by Yunus Kaymaz/Anadolu Agency/Getty Images)

LONDON, ENGLAND - MAY 26: Garden workers in the GMB trade union who maintain gardens and central London parks, including the gardens of Downing Street, conduct strike action in a dispute over pay outside Downing Street in London, United Kingdom on May 26, 2015. (Photo by Yunus Kaymaz/Anadolu Agency/Getty Images)