"This is taking my 1966 Mustang and making sure that it has got four-wheel disc brakes, it's got seat belts, it's got all of the things that it ought to have to be responsible, to maintain control over and be able to use and develop these weapons in a safe, secure way, " he explained.

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Scrub wheels and tires using a stiff bristle brush, and a proprietary wheel-cleaning product if necessary, to remove dirt, grease and disc-brake powder.

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"We must have hit a rock because it smashed the wheel and we had to drive the final seven kilometres with the car running onto the brake disc, " said 30-year-old McRae.

BBC: News | Sport | McRae tumbles out in Sweden