London Mayor Boris Johnson has been wheeled out throughout the year in promotion of the RideLondon cycling festival.
The regular rider will take part in the 100-mile challenge on Sunday.
"My team has told me I will never make it," Mr Johnson said. "They think I am too clapped out to cycle 100 miles but the more they discourage me, the more determined I am to have a crack."
More top news
Mourners donned their masks and capes for a special superhero-themed funeral for a comic book fan who killed himself after being bullied.
Drug dealer who posed for selfies with wads of cash from his crimes is jailed for six years.
The traumatised children had to be rescued by fire fighters after the driver ignored closed road signs during a major flood.