Provided that either your insurance policy or the seller's covers you to drive the car, the seller cannot reasonably refuse a test drive. Make it clear that you'd like to spend half an hour on the road - that's 20 miles or so.

Pick a route covering town driving, high-speed dual carriageway miles, a hill or two, and a few twisty bits.

BEFORE YOU SET OFF

• Does the driver's seat feel saggy - a sure sign of high mileage.
• Adjust the seat and steering column/wheel to a comfortable position.
• Check mirror positions suit you.
• Controls and switchgear may be unfamiliar. Ask the seller to explain what does what.

STARTING UP

• Does the engine start easily and idle quietly and evenly?
• Diesels may be sound a bit noisy at first but should settle down quickly.
• Take it easy until your confidence builds: clutch operation, gear-change, steering and brakes may all feel different from your current car.

ENGINE & TRANSMISSION

• Listen for rumbles, rattles or misfiring.
• Expect lively acceleration in first and second (or auto 'kick-down' mode).
• Accelerate steadily from 30mph in top gear to test for clutch slip.
• Auto gear changes should be smooth and quiet - up and down.

BRAKES

• Brake gently at first. If all seems OK, brake progressively from higher speeds. Watch for 'pull' to one side and listen for squealing discs/pads.
• Does the handbrake hold the car on a steep hill?

OTHER ITEMS

• Does the steering feel positive and accurate?
• Check that heating, air conditioning and ventilation systems work correctly.
• Check out the audio system while you're on the move.