A fancy dress runner during the Flora London Marathon in London, England on April 13, 2003. (Photo by Mike Hewitt/Getty Images)

A fun runner in fancy dress in action during the London ADT Marathon, on April 21, 1991. (Photo by Allsport UK)

Runners in fancy dress prepare to depart from Blackheath at the start of the 2011 Virgin Money London Marathon on April 17, 2011 in London, England. 36,500 competitors will tackle the 26.2 mile course which passes several iconic London landmarks and finishes on the Mall in front of Buckingham Palace. (Photo by Oli Scarff/Getty Images)

A runner in fancy dress participates during the Virgin London Marathon 2012 on April 22, 2012 in London, England. (Photo by Tom Dulat/Getty Images)

A runner in fancy dress participates in the Virgin London Marathon 2013 on April 21, 2013 in London, England. (Photo by Tom Dulat/Getty Images)

Runners in fancy dress participate during the Virgin London Marathon 2012 on April 22, 2012 in London, England. (Photo by Tom Dulat/Getty Images)

A runner in fancy dress participates in the Virgin London Marathon 2013 on April 21, 2013 in London, England. (Photo by Tom Dulat/Getty Images)

Runners in fancy dress participates during the Virgin London Marathon 2012 on April 22, 2012 in London, England. (Photo by Tom Dulat/Getty Images)

A runner in fancy dress participates in the Virgin London Marathon 2013 on April 21, 2013 in London, England. (Photo by Tom Dulat/Getty Images)

A runner in fancy dress participates in the Virgin London Marathon 2013 on April 21, 2013 in London, England. (Photo by Tom Dulat/Getty Images)

A runner in fancy dress participates in the Virgin London Marathon 2013 on April 21, 2013 in London, England. (Photo by Tom Dulat/Getty Images)

Runners in fancy dress participate in the Virgin London Marathon 2013 on April 21, 2013 in London, England. (Photo by Tom Dulat/Getty Images)

A man in a dress recovers after crossing the finish line of the 2012 London Marathon on April 22, 2012. (Photo by Leon Neal/AFP Photo)

Sid Keyte aged 43 from Salisbury in his home-made telephone box in which he will run for charity during the photocall at Tower Bridge, London, on April 11, 2014. (Photo by John Stillwell/PA Wire)

John Melbourne aged 33 from Surrey during the photocall at Tower Bridge, London, on April 11, 2014. (Photo by John Stillwell/PA Wire)