I don't believe YE is being WFU, the 767s are due to be around for a few more years yet. It's off to Brussels on 1/11, one would assume a winter lease to TUI Belgium.
Much of the 767 maintenance is done in Shannon, and November is the ideal time between the end of the UK short haul Summer and the peak of the Nordic operations which the 767 will be deployed on during the winter.