I was on the 777 from Madrid recently. EF showed WT+ being in use but only Y seats available on check in the night before so within 24 hrs and flight under airport control so BAEC couldn’t do anything. Asked at The First Wing when checking in the following morning if WT+ was in use, I was told it was and seat duly changed to 22K. I have to say seat very comfortable as I’ve not done WT+ for 13 years but view was of Wing.

Good of luck tomorrow.