Sarah Lucy Hardcastle (born 9 April 1969), also known by her married name Sarah Thomas, is a British former competitive swimmer who represented Great Britain in the Olympics, world championships and European championships, and swam for England in the Commonwealth Games. She specialised in the 400- and 800-metre freestyle, and also competed in medley races. Hardcastle won multiple major championship medals over the course of her career, including individual silver and bronze medals at the 1984 Summer Olympics at the age of 15 and two individual gold medals at the 1986 Commonwealth Games. She retired from the sport in 1986 but returned in 1993, winning gold at the World Short Course Championships for the 800-metre freestyle in 1995 and reaching the final of the same event at the 1996 Summer Olympics. Career Hardcastle finished second in the 800-metre freestyle at the British national championships in 1982, aged 13. She was selected for the England team at the 1982 Commonwealth Games in Brisbane, where she reached the final of the 800-metre freestyle. In 1983 she won the bronze medal in the 800-metre freestyle at the European Championships, aged 14. At the 1984 Summer Olympics in Los Angeles, she became the youngest ever British woman to win an Olympic medal when she won silver in the 400-metre freestyle, aged 15 years, 3 months and 22 days. She also won bronze in the 800-metre freestyle, and finished ninth the 400-metre individual medley. Hardcastle won the silver medal in the 800-metre freestyle and finished sixth in the 400-metre freestyle at the 1985 European Championships. At the 1986 Commonwealth Games, she won gold medals in both the 400- and 800-metre freestyle. Her time of 8:24.77 in the 800-metre freestyle was the second-fastest ever recorded, 0.15 seconds outside the world record held by Tracey Wickham, and a new European record. Her time in the 400-metre freestyle was a Commonwealth Games record. She also won bronze in the 400-metre individual medley, and was a member of the team that won silver in the 4×200-metre freestyle relay. She won the bronze medal in the 400-metre freestyle at the 1986 World Championships. Hardcastle initially retired from competitive swimming in 1986 at the age of 17; in a 2012 interview she said that after years of training she had wanted to have a normal teenage life. She participated in Prince Edward's charity television special The Grand Knockout Tournament in 1987.