'We have a big party planned'published at 13:31 British Summer Time 22 April 2018
The happy couple have just come to speak to Radzi - who's at Tower Bridge, about halfway round - on BBC One!
"It was a wonderful ceremony at 7:30am, but we are now feeling the pain," says Mel.
"Our daughter Jess will have to put us in a shopping trolley after the race and wheel us back to the hotel," adds James.
"But we do have a big party planned next week."