John Bishop has already taken a tumble – falling off his bike in the outskirts of Paris just an hour into a gruelling charity triathlon.

The stand-up comic, who is attempting to cycle, row and run 290 miles (467km) from the French capital to London in five days, set off from the Eiffel Tower during rush-hour today.

However, just an hour into the BT Sport Relief Challenge, the comedian fell off his bike while passing through the outskirts of Paris.

According to organisers, as he approached a busy set of traffic lights, he struggled to get his feet out of the cleats in time and fell off.

Despite the tumble, the comedian is continuing in the first leg of his challenge – to cycle 185 miles (298km) to the coast in less than 24 hours, the equivalent of 60,000 pedal strokes, aiming to finish in the early hours of tomorrow.

He said: “It’s lunchtime and I’ve done 55 miles – which on any other day in my life would be amazing, but today there’s still 130 odd miles left to do.

“I’m trying not to think about the row tomorrow – and as for the marathons, it’s probably best not to worry about them at all at this stage.”

For the second leg, John – who suffers from bad seasickness – will row from mainland Europe to the UK.

The final stage of his epic journey will see him take on three marathons in three days, finishing in London’s Trafalgar Square on Friday.

Celebrity friends including Dermot O’Leary, Frank Skinner and Robbie Savage will provide motivation when they run alongside him.

To sponsor John or donate to Sport Relief visit