I hope this will open as an addendum to post #11 as they seem to have a nice Speedo team swimbrief now (and better than the Olympics Adidas, IMHO).
No pics that I can find so far of them wearing it however but the Ebay seller from West Hollywood seems to be having fun as usual on his asking price):
http://www.ebay.com/itm/Team-GB-GBR-...SA_MC_Swimwear