Crowds of supporters, many holding banners, have lined the streets of the city to cheer on the runners and wave to their loved ones.

More than 56,000 participants are expected on the 26.2-mile course through the capital on a warm, dry day with temperatures of up to 22C.

And among those on the starting line were Joel Dommett, Kelly Brook, Harry Judd and Adele Roberts, who took to their social ...