Born in
Reading, Berkshire, England, Lake began to compete competitively as an under-13 in 2008 at Slough Juniors Athletics Club. In 2009, she broke the UK U13 pentathlon record with 3046 points. In 2011, she broke the U15 record with 3755 points. At the
English Schools Championships, she won the pentathlon and long jump in 2010 (U15) and the long jump in 2012 (U17). In 2013, the 15-year-old finished second in the high jump at the
British Indoor Championships.
Coaching Lake competes for
Windsor, Slough, Eton and Hounslow Athletic Club and is coached by her father Eldon Lake. She also receives specialist coaching from Jeremy Tigar in the throw disciplines (shot put and javelin), Richard Aspden in the high jump and Ian Grant in the hurdles.
2013 At the
2013 World Youth Championships in
Donetsk, Ukraine, Lake led after day one of the heptathlon by 192 points. The day included a UK Under 17 record of 1.90 m in the high jump, a height that would have been good enough to win the individual high jump event. The previous record of 1.89 m by
Debbie Marti had stood for 29 years. However, on day two she could only manage 4.63 m in the long jump, followed by two fouls. Then in the javelin, she could only throw 30.81 m. These performances saw her drop down to sixth and she withdrew from the competition before the final event, the
800 metres race.
2014 In February 2014, Lake competed in an indoor athletics event in Vaxjo, Sweden, where she broke the World U18 record for the pentathlon, improving
Carolina Klüft's score of 4261, with 4284 points. On 2 and 3 May 2014, Lake won the prestigious Multistars international event in her debut at the senior heptathlon. Still 9 days short of her 17th birthday, she became by four years the youngest champion in the 27-year history of the event. Her score of 5896 points exceeded by 780 points the performance (5116 points) achieved by Olympic champion
Jessica Ennis-Hill at the age of 17 when placing 13th in the same event in 2003. Lake's performance also exceeded by 415 points the previous UK Youth record for the heptathlon (5481 points), set in 2009 by
Katarina Johnson-Thompson. On 18 May, she broke the 23-year-old UK junior high jump record with a clearance of 1.93 m in
Loughborough. The previous record of 1.91 m was set by
Lea Haggett in 1991 and was equalled in 1997 by Susan Jones. On 31 May and 1 June 2014, Lake competed at the
Hypo-Meeting in
Götzis, Austria, generally considered the premier multi-events meeting in the annual athletics calendar. She achieved 17th place, improving her lifetime best score and UK Youth record by 185 points to a total of 6081 points. This performance also ranked her second on the UK U20 all-time list, behind Johnson-Thompson, and improved by 90 points the European U18 record of 5991 points achieved in 2005 by
Tatyana Chernova of Russia, the 2011 World Champion at heptathlon. Lake's individual performances in Götzis included three new personal bests in the shot put, a personal best in the 200 metres and two personal bests in the javelin throw. In July 2014, Lake and her coaches initially planned to have her compete in the
Glasgow Commonwealth Games, but decided against it and headed for the
2014 World Junior Championships in
Eugene, United States instead. She stormed to the top of the heptathlon table with 2096 points, setting a British junior record of 1.94 m in the high jump. The only athlete to have cleared 1.85 m, she attempted a world U18 record and British senior record height of 1.97 m, but failed to clear it. She began the afternoon session with a win in the shot put, throwing 14.17 m to take her total to 2901 points. She closed the day with the 200 m, finishing in third place behind German world youth champion
Celina Leffler and Dutch athlete
Nadine Visser to end with a total of 3821 points and remain at the top of the heptathlon table. Lake started the second day relatively poorly, finishing fourth in the long jump in with a distance of 5.90 m. However, her total rose to 4640 points, still enough to keep her at the top of the heptathlon table. She finished in sixth place in the javelin throw the same morning with a personal best of 41.66 m, but remained on top of the overall table. Lake then closed the day with a seventh-place finish in the 800 m with a personal best time of 2:21.06, but secured the gold medal with a final total of 6148 points, ahead of Cuban
Yorgelis Rodríguez and Visser. On 27 July, the final day of the championships, Lake competed in the individual high jump event, and took her second gold medal with a height of 1.93 m. She and silver medallist
Michaela Hrubá of the Czech Republic were the only competitors to have managed to clear 1.91 m. Lake went on to make three attempts at 1.97 m as she did in the heptathlon high jump five days earlier, but again failed to set a new British senior record.
2016–2018 In August 2016, Lake competed for
Team GB at the
Rio Olympics in the
individual high jump event, achieving a personal best of 1.94 m and reaching the final. In the finals, she finished joint 10th with a leap of 1.93 m. In 2017, she jumped her personal best of 1.97 m in
Birmingham, the second best jump ever by a British female. Lake finished fourth at the
2018 World Indoor Championships, with a clearance of 1.93 metres, missing out on a medal on countback. A month later, she won a silver medal at the
Commonwealth Games, with another clearance of 1.93 m.
2019–2021 Lake was selected to represent Great Britain at the
2019 World Athletics Championships in
Doha, Qatar. She competed in the high jump and was eliminated during qualification after failing at 1.89 m. In 2020, she became
British champion for the fifth successive year when winning the high jump event at the
British Athletics Championships with a jump of 1.80 metres. She also finished second in the indoor competition with 1.84 m. In 2021, Lake once again won the
British Championships with a leap of 1.93 m. At the postponed
2020 Tokyo Olympics, she qualified for the final with 1.95 m but
withdrew due to injury.
2022–present In 2022, she won the British title again, finished fourth in the
Birmingham Commonwealth Games and seventh at the
European Championships in
Munich. After winning the high jump gold medal at the
2024 British Athletics Championships, Lake was subsequently named in the
Great Britain team for the
2024 Summer Olympics. She failed to qualify for the final at the Games in
Paris with a best clearance of 1.88 metres which was 4 cm short of the height required to get through. On 19 July 2025, she won the high jump at the
London Diamond League Meeting with a clearance of 1.96 metres. Lake then won her tenth consecutive British outdoor title at the
2025 UK Athletics Championships. Lake set a new British record by clearing 2.00 metres at the first attempt as she finished third at the
Diamond League final in
Zurich on 27 August 2025. ==Statistics==