do not panic. if car has whitish shite around oil cork it does not mean head gasket. can be condensation. car has not being heated up every day for reasonable time.
do first some straitght driving and see does it heat up, does it build up to much preassure in cawling system, and even so you still can run additional tests, like pressure test to make sure it is the head gasket.
no need to panic in first call, there may be nothing at all wrong with your mates car