In 1974, she co-founded the World Team Tennis (WTT) Pro League where men and women play professional tennis on the same team and contribute equally to the outcome.

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Boltersdorf's clients include several clubs in Germany's elite Bundesliga soccer league and the national men's handball team, which won the world championship in 2007.

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With more than 18, 000 miles on the clock, Roy Hodgson's men have effectively travelled three-quarters of the way round the world to reach the Europa League semi-finals and the journey has not been without its pitfalls.

BBC: From the Cottage to the Continent