BMW’s classiest tuners work their thoughtful magic on the ultimate diesel X3
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The Top Gear car review:BAC Mono
For:Sublime performance, top engineering
Against:Expensive, somewhat impractical as family transport
What is it?
It’s the world’s only single-seater road car: a no-roof, no-windscreen, trackday special from Cheshire-based Briggs Automotive Company. It’s as practical as a pair of lead water wings, but it’s one of the most entertaining cars ever built.