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Tanni Grey-Thompson says Oscar Pistorius should not compete in this summer's Olympic Games.

Grey-Thompson, the 11-time Paralympic champion who set more than 30 world records before she retired from competitive sport in May last year, discusses the potential appearance of Pistorius in Beijing with Matthew Syed in the first of five exclusive Olympics podcasts.

She says she remains unsure whether Pistorius, the double amputee who uses blades to run, should be allowed to compete, although she adds that the South African should be permitted to run alongside able-bodied athletes outside of the Games.

Grey-Thompson also talks about Natalie Du Toit, the disabled South African swimmer who will be racing against able-bodied athletes in Beijing, and discusses the fine line between being a competitive athlete and a cheat.