He won the 3 m Springboard gold and then went to compete at the World Junior Championships later in the season, securing a top result of seventh in the Group B Platform.

In 2013, Lee won medals in all three Group B individual events at his second European Junior Championships, defending his 3 m title and taking silver in 10 m Platform, bronze in 1m Springboard.

[14] Lee and his partner Lois Toulson won a bronze at the 2018 FINA Diving World Series held in Beijing in the mixed platform synchro.

[17] At the 2019 World Aquatics Championships held in Gwangju, South Korea, Lee and Daley finished in the bronze position in the 10 m synchro.

[18] At the 2021 FINA Diving World Cup held in Japan, Lee and Daley won gold in synchronised 10 m platform.

[20] At the 2020 Tokyo Olympics, Lee won Gold alongside Daley in the Men's synchronised 10 m platform event, edging out China's Cao Yuan and Chen Aisen with a total score of 471.81.

[22][23] At the 2022 World Aquatics Championships held in Budapest, Lee partnered with Noah Williams for the first time in an international competition and they won silver in the synchro 10 m platform event.