my guess
Speedo (and British Gas) are always there for national and international diving championships (and by far my own preference too but I have yet to find a pic of TD wearing the latest design at the Barcelona pool for 2013).
Adidas appears at Olympic Games and that may be because there is a big contract on offer for complete team attire and Speedo may not be up to manufacturing so much clothing as Adidas are used to doing worldwide.
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