Ransley was part of the British squad that topped the medal table at the 2011 World Rowing Championships in Bled, where he won a silver medal as part of the eight with Nathaniel Reilly-O'Donnell, Cameron Nichol, James Foad, Alex Partridge, Moe Sbihi, Greg Searle, Daniel Ritchie and Phelan Hill.

[2] Ransley competed at the 2013 World Rowing Championships in Chungju, where he won a gold medal as part of the eight with Daniel Ritchie, Alex Gregory, Pete Reed, Moe Sbihi, Andrew Triggs Hodge, George Nash, Will Satch and Phelan Hill.

[3] The following year he competed at the 2014 World Rowing Championships in Bosbaan, Amsterdam, where he won a gold medal as part of the eight with Nathaniel Reilly-O'Donnell, Matthew Tarrant, Will Satch, Matt Gotrel, Pete Reed, Paul Bennett, Constantine Louloudis and Phelan Hill.

[4] The following year he was part of the British team that topped the medal table at the 2015 World Rowing Championships at Lac d'Aiguebelette in France, where he won a bronze medal as part of the coxless four with Scott Durant, Alan Sinclair and Stewart Innes.

[5] He won a bronze medal at the 2018 World Rowing Championships in Plovdiv, Bulgaria, as part of the eight with Alan Sinclair, Thomas George, Moe Sbihi, Oliver Wynne-Griffith, Matthew Tarrant, Will Satch and Henry Fieldman.