Friend drove into another car while reversing at supermarket. Driver of other car not present so left contact details on windscreen and took photos of damage and registration. Other driver called following day and suggested getting a quote from a repair shop and if my friend was happy to pay for the repair and not get insurance companies involved. Damage is a front wing dent and a cracked rear bumper on friend's car. Both cars 5 years old and around £12-15k if bought second hand today. Should he go ahead, any risks?