(a) That's correct. The High Court of Australia has decided that damages for loss of amenities compensates a plaintiff for the realisation that they have been deprived of the ability to enjoy life in the same way as before - a subjective approach. This means that in Australia, if the plaintiff is permanently unconscious, only a modest amount of approximately $6,000 will be awarded for loss of amenities.
English courts use an objective assessment, so what counts is whether or not a plaintiff has been deprived of their ability to pursue pleasurable activities. In England it does not matter that the plaintiff is unconscious and unaware of the loss.