I had a better list some time ago but take this along and patiently go through each point 
Front/rear bumpers
Scratches or scuffs? 
Bumps? 
Do they line up with surrounding panels? 
Front wings/bonnet
Scratches? 
Dents? 
Do the panels all line up evenly? 
Do the headlights/foglights line up evenly? 
Do the lights work properly? 
Are the lights chipped? 
Doors
Do all of the doors open without any creaks? 
Do the doors close smoothly without being slammed? 
Do the locks work properly? 
Are there any scratches on the outside paintwork? 
Rips, scuffs or stains on interior of doors? 
Do the windows go up and down smoothly? 
Are there any scratches on the glass, or front and rear 'screens? 
Are there any scrapes on the bottom edges of the doors? 
Rear wings/boot
Scratches? 
Dents? 
Do all of the panels line up evenly? 
Do all of the lights work properly, including the foglight? 
Are there any dings in the boot? 
Is the exhaust damaged from poor reversing? 
Excessive soot on the bumper from the exhaust? 
Wheels and tyres
Are they all the same type of wheel? 
Are they the standard wheels for the car? 
Any kerbing? 
Are the tyres evenly worn? 
Any nicks or cracks in the edges of the tyres? 
Are the tyres all the same make or mix and match? 
Interior
Tears or rips? 
Stains or scuffs? 
Any rattly or loose seats? 
Are the seatbelts in good condition and run smoothly? 
Do the seatbelts hold tight when given a firm pull? 
Is the driver's seat excessively worn for the indicated mileage? 
Are the steering wheel and foot pedals excessively worn? 
Is the indicated mileage backed up by MoTs and service records? 
Are the carpets damp from leaky doors or sunroof? 
Holes in the dash form mobile phone holders? 
Holes in trim from aftermarket speakers and stereo? 
Does it smell of cigarettes? 
Are there any cigarette burns? 
Does every button work as it should? 
Is the steering wheel straight when wheels are aligned ahead? 
Are all of the keys present? 
Is more than one key needed for ignition, doors and boot? 
Does the air-conditioning, if fitted, work properly? 
Is the hood of a convertible in good condition and leak free? 
Underneath
Is anything hanging loose or caught on the underside? 
Any leaks? 
Rust? 
Mechanicals
Does the engine start easily and settle to an even idle? 
Does it rev freely when you press the accelerator? 
Are there any obvious noises from the engine? 
Any leaks? 
Are all of the fluids to the correct levels? 
Remove the oil filler cap with the engine off. Is the oil clean? 
Is there any white sludge - this could mean water contamination? 
Do all of the pedals work smoothly? 
Does the gear lever engage smoothly in all gears? 
Does the gearbox or clutch make any unpleasant noises? 
Does the clutch take up smoothly? 
Does the clutch slip? Accelerate hard in a high gear to test this 
Does reverse gear engage and work smoothly? 
Do the brakes work strongly? 
Do the brakes pull to one side when the pedal is pressed? 
Any noises from the suspension? 
Push down hard on the suspension. Does it settle quickly? 
Does the car roll too much in bends or feel too firm? 
Is the exhaust quiet? Are there any rattles from it? 
Is there any smoke from the exhaust? 
Paperwork
Are all of the documents present? If not, why? 
Is there a full service history including MoTs? 
Do the MoTs run concurrently? If not, why? 
Does the seller's name match the details on the logbook? 
Is any work on the car backed up by receipts? 
Are viewing the car at the address on the logbook? 
Do the chassis and engine numbers match those on the car? 
Does the colour, fuel type and engine capacity match?