Paralympic star Oscar Pistorius - known as 'Bladerunner' because of his prosthetic limbs - explains why he hopes to avoid rain as he competes against able-bodied athletes at this weekend's London Grand Prix at Crystal Palace and says he is getting closer to his goal of competing in the Olympics and Paralympics and London 2012.

Diamond League - London Grand Prix
Venue: Crystal Palace Dates: 13-14 August
Coverage: Watch Live on BBC 2 (Friday 1800-2100 BST) and BBC 1 (Saturday 1300-1630 BST) and BBC Sport website (UK users only); coverage on BBC Radio 5 live, BBC Red Button and BBC Sport website Full details