We find the skirts invaluable for storage and so far we have always used the awning as well. I think Pennine will continue to have them in stock for some time but it would be worth checking with them. If not, you could probably have some made up by TVS at Bolton.
The skirts also act superbly well at keeping the camper warmer and draught free, as the cold air and wind are not then directly hitting the underside of the bedboards.