Taking delivery: what to do in the first hour
The car is easiest to reject or correct before you drive it away.
Delivery is treated as a formality and photographed accordingly. It is the last moment at which problems are unambiguously someone else's.
Do it in daylight. Not under showroom lighting, which hides paint defects, and not in the evening.
Walk the car before signing anything. Look along each panel at a shallow angle for scratches, swirl marks from a bad wash, and any difference in finish. Check the wheels for kerb damage. Check the glass for chips. Open every door, the bonnet and the boot and look at the shuts.
Inside: check the trim for marks, work every switch, run the climate control on both heat and cold, pair a phone, and confirm the car has the options you ordered and paid for. Optional equipment missing from a delivered car is more common than it sounds.
Check the paperwork against the car: the VIN on the document matches the VIN on the car, the mileage is what you expect, and the numbers on the contract are the numbers you agreed.
Confirm what is in the car: both keys, the charging cable if it has one, the tyre kit or spare, the manual.
Anything you find, list it and have it written into a delivery note before you sign. A defect recorded at delivery is a warranty matter. The same defect raised a week later is a conversation.