Car clinic: Claiming against a dealer for clogged particulate filter, Mazda RX-8 rotary engine woes and rattling windows in BMW X1

I recently bought a 55-plate Ford Focus estate for £2,595 from a small dealership. Six days later a dashboard warning light came on indicating a problem with the diesel particulate filter (DPF).
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Dom Joly: How to haggle when buying a car

I’m probably the worst person to warn you about what to look out for when buying a car. Despite my day job of fooling the general public, I am putty...