Thanks for the replies, ive just replaced the o ring for now im not sure how buying a new line will be any different to just replacing the oring as the line is metal and should be no different to the existing one, the only perishably part is the o-ring. Makes no sense to me but hey will see soon.
gonna try couple of different sized o-rings too some bulkier ones in the same I/d as now that ive done it once can replace fairly quickly.
also replaced the alternator as im guessing the oil cooked it.
will update this thread if I need to replace the line in the future