David Tremayne in Monaco explains the reasons we have had five different winners so far

Bruno Senna is convinced he will make an impact in Formula One after witnessing at first hand what Williams are capable of this year.

If you were any other F1 team than Mercedes, you might have left China last night hearing the unmistakable clamour of alarm bells. The silver arrows of Nico Rosberg and Michael Schumacher had been fast in qualifying for the opening two races of the season, but ate their tyres voraciously in the races. Not this time. Careful changes had transformed them.

In the season of six world champions, two are on the comeback trail. Ironically, Kimi Raikkonen is the man who replaced Michael Schumacher at Ferrari back in 2007, the year the Finn won his title.

It was, Ferrari summarised perfectly, the day on which the 2012 Formula One season got under way in "indecipherable fashion". The start had been eagerly awaited after three weeks of inconclusive testing, with six world champions ready to do battle and a raft of new cars built to revised regulations. But as proceedings were twice affected by heavy rain, few emerged any the wiser about the true pecking order.

A new theory has emerged about Lord Lucan – that he was living in Africa years after he disappeared following the 1974 murder of his children's nanny. Some of those other theories:

A Finnish court yesterday sentenced former Formula One driver Jyrki Järvilehto to 30 months in prison for a drunken boat accident that killed his friend.

Lewis Hamilton has taken a swipe at his detractors as he gets in a fighting mood for this weekend's British Grand Prix.

Racing legend Sir Stirling Moss has officially retired from motor racing at the age of 81.

Louis Klemantaski was a French photographer devoted to documenting motor racing while it burgeoned during the 1940s, 1950s and 1960s, and the archive that bears his name now holds some 500,000 images of the sport.

Trevor Taylor had a reputation for being unlucky, a hard charger whose "number two" Lotus always seemed to be the one that went wrong, or to whom the big accidents always happened. Blessed with the affability of the Yorkshireman, he was a man at peace with himself and his racing achievements – a one-time hell raiser, long since tamed, who loved to talk as much about his children as he did his days in the driving seat.

Corporate backers are behind Jacques Villeneuve's plans for a Formula One comeback next season, the former world champion said today.

Motor racing veteran Sir Stirling Moss is in hospital today after breaking both ankles when he fell three floors down a lift shaft.