A few days late:
Last Friday (29th March) I was flying from LHR to STR on BA918. Full flight and they asked for people to check in their trolleys. Had nothing major in there, went to the desk, GA took my boarding pass, removed the luggage stickers and printed me a new one. I was shifted from row 19 in Euro Traveller to Row 1 in CE. New BP said "Thank you from BA".