MtaylorLHR welcome to Flyertalk. You will find answers to most of your questions here so do have a look through the postings. The Dashboard is always a good place to start.

However your question is not one that I can recall has been asked before. I would strongly recommend you to contact Expedia and cancel your flights. Depending upon Expedias agreement with QR as to which QR office is responsible for the booking you may find that subject to a cancellation fee your ticket may be refundable. This is very unlikely if it is QRs London office but it is sometimes possible at CPH. Since it is the starting point then it is probably CPH.

Two years ago I took a small group from Denmark for a walking holiday in Hong Kong. The tickets were O and T ticketing class but I was able to change/cancel them when changes occurred. Others who bought the same classes under a 'Sale' were not able to do so according to postings on this forum.