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In her brilliant book about Frank, his wife Ginny gives an eye-opening account of the days after the accident.

Williams was a very active man and a keen runner but even when his life was still in danger immediately afterwards, he never - not even to his wife - betrayed any sense of self-pity, depression or any of the other emotions that might be expected of someone in his situation.

He talks about it very little, and simply says to Ginny that they have had several good years of one kind of life together and now they just have to get used to a different one.

Williams's partner, the team's director of engineering , says: "I'm sure Frank had some terrible moments thinking about the change in his life but he's never been one to sit around and be sorry for himself.

"Frank has always been very pragmatic about 'what is the problem and how can I deal with it' and applied that to himself and his injury.

"His enthusiasm and positive attitude always overcome any difficulties he has."

This is the approach Williams has applied to his disabilities ever since.

Looking back, he says in his clipped manner: "I've had a wonderful life; wouldn't dream of changing anything, truthfully."

Williams suffered his injuries when he crashed his hire car while racing his driver to the airport after a pre-season test in the south of France.

He discusses the accident now with the same detachment he displayed in recovering from it.

"The car banged over a few times and I'm ashamed to say it was either the sixth or seventh rollover accident I'd had in my life," he says.

"I remember the sharp pain in my neck. I thought: 'Wow, rolling over isn't supposed to hurt that much.' The car finished upside down and I tried to reach for the safety belt to get myself out and I couldn't do it.

"I knew I was going to have the big one but I couldn't slow myself down."

The first few months after his accident he spent focusing on getting into a condition that would allow him to get back to attending races.

"He runs himself with military precision," says Head, "and once he'd found out what the things were that would cause him problems, he adapted his lifestyle to give himself the best opportunities. He's very disciplined about that sort of thing - it's remarkable what he has done since then.

"Frank's always been quite private in his own emotions and in control of his interactions with other people. Once we'd got used to the fact that he wasn't the same person he was before, that he was in a wheelchair, things just sort of carried on as normal."

Stopping competing in F1 never occurred to Williams.

"The thought of retiring or selling the team never crossed my mind," Williams says, "and I also suppose recognised subconsciously it would be a great daily antidote for the difficulties I would find myself in. It's a fantastic job, a very exciting business, highly competitive, always something to worry about, which can be quite healthy, actually."

At the time of his accident, his team were about to embark on one of several periods in which they have dominated the sport.

But success was a long time in coming. Getting to the top of F1 was famously a struggle - Williams operated his team out of a phone box at one stage in the early 1970s, so tight had money become. Once he had achieved success, though, he did not let it go for a very long time, regardless of the misfortune that was to befall him.

The turning point was joining forces with Head, whose first car for the team in 1978 established them as serious contenders for the first time.

In 1979, they missed out on the title only through poor reliability and . But they made no mistake in 1980, with Australian romping to the championship.

They remained more or less at the top of F1 from then until Williams's accident, just missing out on the drivers' title in 1986 but winning it in 1987. But when at the end of that year they lost their supply deal with Honda, producer of the best F1 engines, people wondered whether, with the boss in a wheelchair, they would cope.

That was counting without the incredible commitment and desire of this remarkable man.

Williams and Head have formed a formidable partnership for the last 30 years

Before long, Williams had replaced Honda with Renault, and the team went on to its greatest successes - particularly the 1992 and 1993 seasons, when a car bristling with technology such as active suspension brushed the opposition aside with and then at the wheel.

The team have variously dominated F1 in the early 1980s, the mid-'80s, and the early to mid-'90s, winning drivers' titles with many famous names - Jones, , Piquet, Mansell, Prost, and , along with nine constructors' championships.

They have also provided the platform for some of the sport's most brilliant engineers to make their names - among them , now in charge of design at world champions , and , who ran Ferrari's technical department in their dominant period with and now boss of the team.

But there have been dark times, too - particularly the death of at the 1994 San Marino Grand Prix only three races into his Williams career.

It remains one of William's greatest regrets: "I felt that we had been given a great responsibility providing him with a car, and we let him down."

The last few years have seen Williams slip from competitiveness. They have not won a world title since Villeneuve's in 1997 and not taken the chequered flag since the final race of the 2004 season.

And for the first time there have recently been signs that the 68-year-old Williams is slowing down a little.

In November 2009, he and Head sold 10% of the company to Austrian businessman Toto Wolff, with the two men's own shareholdings reducing proportionately from 65% (Williams) and 35% (Head).

And last summer, , with Williams remaining as team principal and Head still in charge of the technical side.

When he made the announcement, Williams emphasised that while he was planning for succession, he was certainly not retiring.

As Williams's current lead F1 driver, the veteran Brazilian , says: "I've never met anyone with so much passion for motor racing - it's truly amazing."

So much passion, indeed, that when he had to make a decision a few years ago between building a wind tunnel that would help make the cars go faster and keeping the private plane that allowed him to attend the farthest-flung races, he chose the wind tunnel.

Williams's voice is quieter now - talking is uncomfortable for him, as a result of his disability - and his eyes a little more watery. But a few minutes in his company leaves you in no doubt that his team's current lack of success pains him greatly, and that he is as committed as ever to getting them back to the top of F1.