A cyclist who discovered he had a heart condition after he passed out attempting to ride the length of Britain is planning to cycle around the world.

Tom Williamson, from Canterbury, is due to set out on Wednesday to cycle more than 18,500 miles (30,000km) across at least 23 countries in aid of Cardiac Risk in the Young.

The 32-year-old lost consciousness while cycling between Land’s End and John O’Groats in 2021 and has since undergone a heart procedure.

“There was a long period where I genuinely felt like my future of exploration and adventure had been taken away from me,” Williamson said.