Singer Rod Stewart has snubbed requests to appear as a guest on U.K. motoring show Top Gear due to his lack of car knowledge.

The Maggie May has a vast collection of luxury vehicles, but admits he knows very little about how his motors work, and he doesn't want to be caught out on the hit BBC series.

In his autobiography, he writes, "Mechanically speaking, I don't really know one end from the other. They keep asking me to go on Top Gear - but I'm worried they're going to start talking to me about camshafts and drivetrains and using words like 'torque', at which point I'd be lost."