I'm not sure I would hold my breath for any DE slots becoming available in the near future. The basings and onshoring are such an incredible mess.
A little birdy told me that Swire has become so completely exasperated with what has been going on, that they are sending a professional who has the appropriate experience to sort out the mess. He has been given 12 months to do it. Much better than having a secretary or engineer doing it.
Until they actually know what they can get away with "legally" I don't think they will be adding to their woes.