Originally Posted by Dave Noble

Looking at the fare paid and that there is approximately GBP417 in taxes/fares disguides as charges , this gives a base fare of around GBP2427

Looking on Expert Flyer, the only r/t fare around that price seems to be the DNNC00S5 fare - which does book in D class and does have a GBP300 change fee

It seems that the agent is giving you correct information. If you havent yet flown the outbound, it would seem to be refundable subject to a GBP150 cancellation penalty. You could then try rebooking on another airline. There seem to be a lot of options for business class on other carriers starting at GBP1000 r/t for 20-26 Nov