I want to buy a Cat D BMW 1 Series - how do I find out why it was written off?

I'm thinking of buying a Cat D BMW 1 Series. The seller doesn't know why it was written off. Can you help?

Is a car with Cat D damage still worth buying?

I want to buy a Renault Wind roadster, but it has a Cat D for bumper damage on it. Is it still worth buying?

Buying a write off - is it worth the risk?

Is it ever worth buying a write off? I've been looking at a Category C Ford Fiesta that seems very good value. It has had two MoT passes since the write off. Is it still a big risk?

Would you recommend I buy a Lexus IS 250, a Mazda 6 or a Mercedes-Benz CLK?

I am in the process of handing back a company car (Ford Focus ST-2) and am now in the market to purchase my own car. I have a few choices: Mazda 6 MPS - 2006-2007, Lexus IS 250 - 2005-2006 or a Mercedes-Benz...