Oscar Pistorius had cause for double celebration after winning a belated first gold medal of London 2012 - and finding an ally in his blade crusade.

The 25-year-old, who sparked huge controversy by attacking the long blades used by some of his rivals after being beaten in the 200m final on Sunday, showed his pair are still working just fine by claiming relay gold.

Pistorius brought the South African T42-46 4x100m team home in a world-record 41.78 seconds, out-running his 200m conqueror Alan Fonteles Oliveira in the process.

In the end that did not matter as Oliveira's Brazilian team were disqualified for a changeover problem.

Pistorius, who earlier in the night had breezed into the T44 100m final - the second fastest qualifier behind British teenager Jonnie Peacock - was quick to again emphasise his remorse at the timing of his criticism.

"One of the things I've learned - you can be humble when you win, it's easy. But to be gracious when you lose, that's not something I did and I'm very sorry for that," he said.

But American sprinter Jerome Singleton, the 100m world champion ,and another contender for gold in the final tonight, claimed the South African icon might have a point.

Despite being billed a T44 race (single-leg below-the-knee amputees), the races also include T43 runners, who are double amputees, like Pistorius as well as Oliveira and Blake Leeper, both of whom wear the longer blades.

Pistorius himself cannot switch to the longer sort if he wants to carry on competing in non-disabled competition as they have to conform to stringent IAAF regulations.

Singleton said: "I think the T43s and T44s need to split classes. It's not apples to apples - it's apples to pineapples right now."