EDI base is indeed earmarked for closure with a high number of redundancies as a result.
As well as the GLA-EDI movements, they have quite a lot of weekend duties where LCY-based crews either position back into LHR on Friday/Saturday or position out of LHR on Sunday/Monday to start touring patterns through the BACF network. I dread to think how much that all costs. Last season's LCY-Ibiza Friday night was probably the crowning glory of expensive crew duties with a crew positioned down-route to take over from the crew incoming from LCY who then positioned back.