Four-time London champion Eliud Kipchoge and Olympic champions Sifan Hassan and Tamirat Tola among the favorites in Sunday's London Marathon.

Once a year, on a Sunday in April, London comes together to celebrate one of the great sporting occasions. First the elite racers will set off - and the fields are stacked with Olympic and Paralympic champions - then thousands will take the streets each of their own special reasons to run 26.