Buyer beware…

Q ENGINE

Although it’s rare, check for head gasket failure on K-series engines. Also scrutinise the quality of the coolant and, regardless of the engine, the condition of the coolant pipes. On all engines, check the oil pressure and that servicing has been carried out every 12,000 miles. Listen for topengine noise, caused by oil starvation on track days or by oil foam dispersing and blocking the oil feed pipe.

Q TRANSMISSION

Listen for gearbox, clutch and, if it has one, differential noises. The Ford T9 five-speed ’box is tough and Caterham’s six-speed unit really suits the K-series engine. Check the condition of the clutch cable.

Q TYRES, BRAKES AND SUSPENSION

Expect brake pads and discs to have lots of life remaining. Check for uneven tyre wear caused by incorrect wheel alignment or worn suspension. Inspect the condition of the front wishbones.

Q CHASSIS

Watch for galvanic corrosion where the steel chassis rails and aluminium panels meet. Check the tubular steel frame for rust and cracks in the welds. The Seven suffers acute gravel rash on its lower sections and, in winter, road salt plays havoc with any bare aluminium. Inspect the underside for speed hump damage.

INTERIOR

Check the condition of the seats where careless owners may have trampled on them to get in, and the windscreen rail, which some use as a handhold.