There was a single Qantas flight with Savers for the return at around GBP130ish, but we don't know how many seats, and given there are quite a lot of tickets sold ex LHR/to LHR chances are the seats at that fare were sold.

Just bad luck unfortunately, can't blame EK for that. In terms of not finding the fare on the website, possibly poor UX design, probably because its a codeshare flight not operated by EK so they hide it further down.